1) There is nothing crazy about what she introduces early on. At 8 month old she introduces making sandals and basket (used as a trap to catch fish) out of grass. And even then she has the help of her older brother (who does all the actual work). The limits of a baby is mostly due to lack of muscle buildup, if someone retains their memories, building up their ability to talk and basic muscle action is not an issue (and even then she couldn't walk well at 8, and again her brothers help is only reason she got things done). Once the starving children got their hands on food due to her, she was able to command them without issue. From then on, she got some recognition from the starving village little by little. But the things she introduces is very limited, basic agriculture reform (which she only just barely introduces prior to being taken away, this took her 10 ENTIRE YEARS). And a few simple to make tools. All of these tools can be made by anyone with access to wood. There is no decades of experience here being crammed in.

2) A lot of people also seem to miss out on the cultural issues. For example, why the parents sold her after she solved the hunger issue. But there is a few things to be noted:

a) If you follow the story so far, outside of mages, civilization seems to have been on purpose bred to be docile. Ever since the revolt centuries ago, the mages seem to have undertaken measures to insure that there is total reliance on mages, even if you want to eat, you have to rely on mages. Nobody has any weapons, even a basic knife. All weapons are made by mages and can be dispelled by mages.

Aka, people are bred for s*upidity and reliance. This is why even merchants are in reality just decedents of nobles who did not get peerage. At first it might seem silly, but once you understand the culture and history of the world building it makes a lot more sense.

b) In those ages, being sold to a noble is most likely considered a priviledge. They did not exactly cover commoner marriage in the novel, but in most middle age societies. The girl leaves the family and the house has to provide a dowry. A noble paying you silver for your daughter is not a bad deal to them. And neither would they think it is a bad deal for their daughter either.

Actually there is even a practice if your child is a mage to give them to nobility. So they are also in a way trained in such actions.

c) To be honest we don't actually know if the parents even know her value. Most of the aid she got was from her brothers (who actually do care about her, one of them even drops everything to go search for her after). The only time she got her parents to do reforms was by tricking them telling them she heard our neighbors do it and etc. Aka, it is questionable how much their parents actually knew about her value. Now don't get me wrong, they knew she created some tools that helped and etc. But it is hard to say how much they actually understood. Because the only thing they thought about is if she was a mage or not.

Also, the villiage they live in is an expiremental villiage. Aka, these villages are not ones where people who knew each other from birth lived in. These are villages that were recently formed. So the conection between villagers is pretty weak. Aka, it is more like everyone for themselves rather than carring about your neighbor that much.

3) The noble DID NOT buy her to be a s*x s*ave. The noble who bought her wanted to educate her. But education can only be given to nobility. So what he did was to make her a temporary maid at his sister's house to get an education along side her son under the pretense of having a maid same age as her son to get along better. Once she got the basic education, he planned to make her his daughter and eventually his wife. Once she has meen a maid at his sister's house for a few years, the sister proposed to use her to offer s*x education to her son. (Which by the way was part of maid duties in some places during middle ages as well). The noble did not like that either, and took her back. (They did not try to hide her, she just got taken back because he had no excuse left for keeping her with his sister as he did not want her continuing her maid services there). Instead she would work as a merchant apprentice. On the way there, she got kidnapped by bandits.

4) Only mages or their spouses can be nobles. Period. The only reason why the nobles are hard working is due to the decline of magic users being born. The society they have is slowly collapsing which is part of the story. Back in the day when the system was set up, there was plenty of mages to go around. So there was little work. As the amount of mages declined, they ended up doing hard work due to being too much work. Hence the setup of the expiremental villages to minimize use of mages.

5) A lot of people also do not get why people are being so lazy saying "this is too hard" or etc. The reason comes down due to difference of perspective. The main character thinks of efficiency, aka how to make Job A easier so more people can do Job B. The responses she gets is people who are used to doing Job A, don't want to bother with Job B which they are not familiar with. Same reason why your parents don't want to bother learning the computer and always call you to do it for them. They are used to doing things one way and have no interest picking up new things. But again, I repeat, they were bred for reliance.

6) Also, it should be noted that magic in this world is also harder to compeat with for tools. Particularly because 1 yarn with magic can turn into 3. So it isn;t about just making yarn with tools. You need to build a whole supply chain to sustain 3X more yarn to compete with a mage.

Parents have seen their child solve their village's hunger issues? Parents say lets sell this child for a meager 3 silver coins, a noble bought a intelligent child that can make tools and sell them causing the territory to flourish? The noble said lets make her a s*x partner for my kid for the purpose of education (s*x s*ave), well they decided to hide her away to another land and got kidnap by bandits, since then story is going downhill faster than the Hindenburg passenger airship LZ 129

The village she was in started improving, what happens? She gets sold, the territory she got sold in is improving, what happens? She got kidnapped. The group that kidnapped her started improving, what happens? The bandit group left her to a friends territory that needed improvement, since they didn't have any magician. BUT the author didn't bother doing anything in that territory, and just went directly to school arc. The story stops there, since there's no more updates, I'll bet when the School Arc gets interesting, she'll run away and/or stolen by another country or something.

MC were supposed to be a critical thinker and independent right? Lets just turn off her brain and willingly submit to an insane potential mass killer, just because apparently she wants to show her resolve about being a softie and to influence palace politics with her new position (in the end, she wasn't allowed any authority and the just idiotically walked around the palace, got made fun of, got bullied by Sleazy, gave up on her all material possessions, got forced to pay for her own wedding expenses while marrying sleazy because palace is bankrupt, and her influence on common people got exploited by the palace.) In addition, she also saw that king was coward and mentally unstable, thus unfit for rule, Sleazy is not only insane but also capable of ending entire human civilization on his own on a whim with a spell, the palace is full of useless idiots. Yet this f*cking ididot of a woman, who were supposed to be not a pushover and free, does what? ABSOLUTELY NOTHING. She passively waits until... Until... Until what? Probably Male lead saves her, because that's what (author) (most probably a f*cking ret*rded girl (author) with a prince on a white horse complex) god intended. This story is not ruined for me, I just can't enjoy it. How the hell you see that palace and idiotically hope that peace is better than war and that things are going to be better for the common people? And just let everyone walk over you? MC has no pride or brain at this point. She is enduring this f*cking stuff for absolutely no logical or emotional reason. Just f*ck you, author. You ruined your novel. I am not even going to talk about how she opposed commoner uprising of her former comrades against the king. This novel really disappointed me.

She's born to one of many recently established peasant village on the far outskirts. It's more or less designed to fail killing everyone with starvation and reducing the total burden of the territory quietly (Which is why in the early story everyone is an idiot). Non-magic humans are generally on the level of s*aves and cattle with a few exceptions. Tools, material and manufacturing were strictly controlled to make sure mages will remain in power. Non-magic methods of manufacturing similarly is illegal. The mage class themselves are now facing a crisis due to a lack of new mages being born which compounds several issues since they made themselves the backbone of the economy. The non magic folks are unbelievably oppressed and the magic folks are on the brink of a societal collapse of their own making. The class distinction is so high than in a school where the top magic ojou-sama get's into a conflict with our non-magic MC she doesn't even get mad or know how to respond. To her it's like seeing a talking cow. It's just so weird that she's not even sure if she's supposed to be offended at the livestock.