@Mrina
That is because she has finally been put in an environment that allows her to express herself in a way befitting her age.
It is just like children of extreme poverty behave. Many are willing to go torturous work for pennies to help their families, act and do things that does not fit their age, but if they get put into a more stable environment, they will slowly revert back to being children again.
It is a forceful survival bejavior. That she is becoming more like a child is actually proof of her psyche slowly improving. I don't like a character if for that character to remain like they currently are they need to continue living in torturous environment.