That explains why she's still 4 years old instead of 9! Time gap between two dimensions. And also probably why her mom told her that they're from the distant star (a.k.a another dimension)
https://mangamirror.com/manga-list/106967
I'm a bítčh so if i try to start an argument pls don't reply,i just want to waste your time cuz I'm probably bored.anyways fùck this world 😍