My girlfriend found out that her roomate was engaging in drugs and parties while she was out of town last night. My girlfriend is the only person on the lease, the other girl is not even listed as an occupant at this current time. They did split the deposits and monthly rent. Does my girlfriend simply need to give her 30 days notice? Or can she give her less since she's really just staying over, since her name is nowhere? Also, when it comes to past deposits and rent is my girlfriend responsible for refunding her any of this? Thanks for your help