Hmm I mainly skimmed the thread, and my top items would be microwave and espresso machine, perhaps a mini fridge for her room (if she has an apartment and roommates that small space that's just her food/drink can be priceless). George Foreman grills are ok, the larger ones are a pain to clean since the cooking surfaces can't be removed, in college I cooked in my hotpot more than anything else.
Other brainstorming since I don't know a lot of details such as how far from home this is, whether she has a car available, how much stuff she already has, how exactly close you are with her, her parents etc.
A voucher for a train/bus/plane ticket home to visit her parents
Get together with parents and put together some basics for home entertainment system. The centerpiece of a college apartment is the living room, with a battered couch and the best home entertainment center/tv/stereo/surround/dvd/vcr the whole household can scrape together.
A pre-paid cell phone if she doesn't already have a cell. She can then use it as she wants or emergency only, also makes for lazy gifting later, you just refill the phone.
Gift certificates are not as useful/personal as taking her shopping and being there to help choose things or answer questions for her. When I got my first apartment I went with my Dad and we filled a cart with microwave and dishes and such and that was my birthday for that year. You can go to places like Target, Bed Bath & Beyond, Pier One, Crate & Barrel, whatever suits your budget. That way you get to help and see the personal touch, and the event is more about the time spent than the money spent.
A tool box and tools, my fiance had a better tool set than I did when we moved in (except that one tool that she lacks and I was born with, you smarta$$es)
Or you could just cheat and get one of those huge bath assortments from bodyworks or the like, but those are gambles on the scents.
HTH
KF