She needs to go to foster care.

Foster care is one of the worst places to go. Assuming foster care will be better is literally laughable.

I have never read Lolita so I can't comment on their relationship.

Anyway, what you described many adult women do, but it is important to note these adult women come from abusive backgrounds as well. It would be ludicrous to do the same for these adult women, even though battered woman syndrome is something "they can't help". Once again, you decide restricting all for the sake of a few is the best. The fact is most people will do what is in their interest and what they feel is best. Usually this is a good choice. The problem in today's society is not kids and teens not being able to leave abusers because of their own issues, it is because the state often doesn't let them leave. They are not given the choice. You continue to advocate for such a system.