tia is still a kid actually, she got memories of her past life but didnt reincarnate (key word here) so she only remembers some aspects of her past life
if you look at it most of her flashbacks recalling her past life memories was just her as a kid insinuating that she probably passed on at quite an early age
and she did mention that she didnt study much
but then looking at it compared to a renaissance fantasy like environment compared to the modern world it’d be hard to pass on “common” knowledge to a different era unless u were like a genius— for example u can probably bring like some topics but like usage of technology, political system, work etc would be harder to incorporate since the world she lives in now has an already existing system and challenging it can only cause confusion and perhaps something more sinister

Really no offense! I like the story bc it's unique and also cute sometimes, but at the same time the MC (FL) irks me a lot. She seems stupid, oblivious, doesn't think ahead and doesn't listen. Wasn't she an adult in her previous life or did I get that wrong and she was actually a child and that's why she behaves like that? If so then it makes a little sense
But please don't be mad at me, I still like the story (●'◡'●)ノ