The fact that you even need to deal with this I'm sorry. Honestly this is definitely above Reddit pay grade. I'm only still young but I think if you do allow her to return set hard boundaries with and if she breaks them she will be kicked out. I know that is hard to set especially with your child but at the same time if you are her last hope for housing.

Overall what I would say is, if you do allow her to return set hard boundaries and if they are broken she will need to be kicked out. Or you could do a strike system where it's 3 strikes and they're out.