This is something that your DD has to decide. You can refer her to the answers on this post. They vary greatly. It really comes down to how much of an imposition this is to your and daughter.
This isn’t a new phenomenon. Back in my day, we’d get “sexiled” too. When it got chronic, someone would feel imposed upon, and a discussion would have to happen.
Personally, I’d find a place for the two nights. It would be a tense situation sharing the room with a third person after declining to leave. I never had any problem finding someone with a sofa or a pad for the floor, and it made for good will. My roommate had a BF at Princeton visited regularly. Having to vacate the room for SOs visiting was a common occurrence and we’d have overnight guests in our room at times who were sexiled as well. Not only for over night but for privacy time for an afternoon or evening.
Where it became a problem was when the roommate become downright abusive of the favor and it became a very regular thing or started bringing one night stands there.
But this is your DD’s decision to make.