Anything from Bath & Body Works.
fast food gift card
gift card to a clothing store.
A gift card to wal-mart or somewhere she can get a variety of things.
Time to relax. Bet that most college students want that.
I normally don't like the idea of giving someone money for Christmas, but if she's in college, she likely really needs it.
A massage to take out all the tension and stress.
Music. Or a gift card for some. :)