What should my cousin do about her roomates/landlord?

My cousin is currently a drug addict in recovery. She recently found a room for rent through one of the classified pages on Facebook. The room is $400 a month all utilities included & she was sharing the house with the owner of the house & one other roommate. She talked back & forth with the owner through texts & the owner knew she was in recovery & said that she herself had never had a drug issue but she would help my cousin the best she can, they met up the next day & my cousin moved in 3 days later. Everything was great the first week, the owner was really helping my cousin out and motivating her to do better. After a week, my cousin found out the the landlord moved another roommate in, then a few days later she moved another roommate in. This is in a 3 bedroom house, so someone is even sleeping on the sofa. They took the air conditioner and the television out of my cousin's room (they belong to the owner, but they were there when she moved into the furnished room, so she assumed that they were going to be there for the duration of her stay).

Fast forward to now, my cousin has been there for about a month. Every single person in that house (the owner, the roommate that was already there, plus the two new roommates) all do heroin (my cousin's drug of choice). She never signed an actual contract other than she will pay X amount of money per month. Moving out isn't really an option because she can't afford to pay a second rent this month. What are her choices?