Well, even if she wants to use her knowledge from her previous life, what will she use? It wasn't like she was a politician. There's no knowledge for her to use.
There is actually, she could make bleach, dish soap, soap, face mask, containers there's alot she could do, especially the fashion. She could help with algirculture, if you come from the modern Era there's no way you can't be helpful or make any changes. Like there's plenty from small stuff like seasoning, clothing textiles, electricity, cooking, pizza, donuts, popcorn etc. Even if you only have basic knowledge from the 21st century you'll still be able to do something. But my whole point is why give her a whole life on earth only to use a fraction of it with what she did in her spare time. That's the my whole problem with reincarnation, why reincarnate from earth and not use any information you gathered over all those years to change the world you're currently in. And it's not like it's fine cause they have all types of problems from slavery, incest, women's rights and everything. Why have modern knowledge if you don't make modern decisions
Those things you mentioned, are already there. It's not like everyone who transmigrated have to change their world despite not having any ideas about politics. If talked about changing, she's already trying hard to change her fate. Not every protagonist who transmigrated have to do all that stuff, unnecessary stuff. Look, every story has different plots.
I'm just wondering if she's going to use her knowledge from earth while governing the nation,if feels weird for her to be reincarnated and just be mature like, what's the point of her being reincarnated??