Also, definitely remind her not to do any excessive talking! The less talking she does, the better-she should save her voice for the actual parties and meetings, not for conversations in line or in the bathroom between houses.
If she has any way to do this, I'd recommend making a small drink I've used a few times: it's a cup of boiled water, two teaspoons of apple cider vinegar, half a lemon's worth of lemon juice, a sprinkle of cayenne pepper and as much honey as is necessary to drown out the other ingredients. I have NO clue how a PNM could make this in a dorm, but if she can, this drink is magic.
Best wishes to her!
