I would try to confront the issue and if nothing is really making improvements then perhaps she shall find another place. A home should be a safety zone and not packed with drama and overtake. I would start speaking to both of them.
@jessicasanchez, there needs to be common ground or it’s not going to work. You need to let her (and him) know expectations. It sucks to have to make rules for adults who should know how to behave properly but it seems like it’s the only way this will work. Nice of you to lend a hand when they needed help.