I like the manga, but it's still hilarious that some (high school?) girl somehow makes it big in the stock market. 🤣 It might be possible if her parents gave her some capital, but from what she says they're probably too selfish to even give her that. And even then, I doubt she has the experience and time to day trade before she earned enough to retire. Even if she started with the minimum amount of money to trade, it would take ungodly luck (regardless of experience) and time to amass enough for early retirement, especially at her age. Not that this would matter after she was isekaid of course. This is my only complaint about the manga since I felt like it added nothing to the story and to her character.
Her parents also have no spine to force her to go to school, the exception is if she was bullied or something.