You are not getting that this is not about you, it is about EVERYBODY. This is a sick person that is STAYING PUT and you are mad because her doing what she is supposed to do is not working for YOU. She got sick there, she SHOULD STAY THERE. Not walk around, hop in a car with people who have not been exposed already. That is spreading germs right there to two people that were not previously exposed to her germs. And then what do her parents do now? Go out and expose more people or stay home? Well how about their daughter just stays where she is and doesn't even expose them to begin with and they at least can go about their lives hoping others are staying put? She got sick there, the germs are there. There is zero reason for this person to move anywhere else and people that try to justify her moving to a different location are not paying attention to the issue.
As for your daughter..... she was exposed before her roommate even went to the Doctor.
Be part of the solution, not part of the problem.