Since no one has given you any constructive feedback, here are the first things I'd consider.
1. Staying the same room overnight for several days guarantees exposure so I would suggest that your daughter suggest that her roommate leave (go home?) until she tests negative. It's irresponsible for her roommate to attend classes or move around on campus while she is infectious.
If the roommate is unwilling or unable to move out, then your daughter should move out until her roommate tests negative. She could stay on an inflatable mattress or a sofa in another friends room, for example. It's only for a week or so.
2. She should also take vitamin D3 + K.... maybe 10,000 IU/day for a week. It's a little too late to get a benefit from vitamin D, but since she's not sick yet, it won't hurt and it might help.
3. She should use an antivirus nasal spray twice a day and anytime after she has been exposed to her roommate. Not much data on this, but again, it can't hurt. XClear and Povidone Iodine nasal sprays have been shown to kill viruses.
4. If she stays, she should urge her sick roommate to use an antiviral nasal spray 4x/day. If it reduces the virial load in the nasal passage, it could potentially prevent her roommate from spraying it around the room as she talks, laughs, sneezes, etc.
There is a covid infection protocol on the FLCCC website. You can check it out for more suggestions.