#1. Your daughter should remember to make sure - and I stress - that she remembers what she is there for. It's for her OWN recovery.
#2. She should tell a counselor or aide at the sober living facility about her suspicions. And then try her best to go about her business. The aides will know what to do. I hope they have some kind of authority figure there, I am sure they do.
I speak from experience. I was in a treatment center where 3 of the patients were kicked out for using meth, while in treatment. Someone had smuggled it in for them, and they were getting high outside on their smoke breaks. I was in for alcoholism but we had all kinds with us. I also had a roommate that went into our bathroom for 3 hours every night and would lock the door and not come out. He would sleep all morning and would not come to breakfast or meetings. I told the counselors, they took him away for a few days to speak with him and ask him if he really wanted to be there, etc. I didn't want to get involved but I had to - and that is the best way to do so, just tell someone in charge and go about your business.
Treatment centers and sober houses have all sorts of sneaks who are used to criminal thinking and have severe addictions. We were not supposed to have cell phones - but both my roommates during my stay smuggled theirs in. We were not supposed to leave, but some people snuck out anyway. We had drugs smuggled in (per my earlier description) and several people left halfway through because they couldn't hack it.
As a patient or sober living resident you have to take this very seriously. You have to GO to the meetings, the sessions, and you have to follow the rules - even when others DO NOT. That is a key part of getting well. I hope your daughter can remember to keep her eyes on her own homework, and also tell an authority figure and then move on and deal with her own business.