Roommate turned squatter, what do I do?
First time posting in this subreddit so forgive me if my formatting is off. This is in the US (CA) and the roommate in question was not someone I knew prior to her moving in. I live in student housing so everyone has their own lease with the apartments and roommates are essentially assigned randomly unless there are any major issues (ex: allergies to a current tenant's pet) and we share a living room/kitchen but have private rooms and bathrooms. I had already been living in the apartment for about two years when this roommate moved in. I'll refer to her as S. S managed to get herself evicted within the first month of moving in by violating the lease agreement on guests by pretty much moving her family in without notifying the office or putting anyone else on the lease with her. S was evicted but is still staying in the apartment with her kids and partner and they've actually broken in to the vacant rooms (which are always locked when not occupied) to give themselves more space for themselves and their frequent guests. I have a lot of other issues with them but they seem kind of petty in comparison to the whole 'being willing to break into locked rooms' thing so I'll leave them out. My question is: Would having squatters generally allow me to break my lease due to a potentially unsafe environment? I'm planning on asking management if I can move to a different unit since I can't really afford to leave but they've been pretty much useless with everything else so far. I'd appreciate any insight into what I can do to protect myself in this situation.