I’m taking a new perspective on these types of characters who “regain” their memories yet continue to act as though they never actually matured. Rather than “regaining,” I think of it as a child watching a movie where the mc in it is “them.” like a sort of insight into the future.
Or the mc wasn’t able to properly mature due the the isolated environment she was raised in. But there has to more to it than just that. Maybe the abuse or maybe the isolation was not only from people.