It is very stressful, but a lot of students are self-isolating right now. She's not alone in a room, she will be able to mix with the other people on her floor, no?
If one of them had corona, the chances are she is at risk or has it herself. This is stressful news. Her coming home is not a good idea though unless you can genuinely cope with the idea that she is bringing it with her.
I have about 10 self-isolating students on my courses at present. One real issue for students is actually how asymptomatic it is- so many do not realise they have it and are spreading it all the while. Or they have very mild symptoms and don't realise what it is. There are exceptions to that OperationallySound sorry your DC is still sick.
Asymptomatic spread, by people at a sociable time of their lives, is what is driving these outbreaks (as a person who gets really sick starts to isolate quicker).
I think a phone call every day, send her a parcel, but do encourage her- she is not alone, and she does have people around her, and it will be over in two weeks. I also have students quarantining from abroad, so this is sadly a more usual experience than we might expect.