One lifesaver, though it isn't usually nutritious, is student group meetings. If she can't handle the cafeteria (I go to a small school with a SMALL selection of foods), find a student group that has weekly meetings with dinner provided.
Getting creative with food in the cafeteria is super important. We had a wok with vegetables you could fry, but I preferred to put the premade pasta in, add a little spinach from the salad bar, some garlic, and some hummus. A waffle iron also makes great grilled cheese. I don't eat meat, but my friends said it was edible if you put it in stir frys, sandwiches, etc. Some schools (unfortunately, not mine) have an omlette bar, which is a fantastic breakfast. Delicious, lots of protein, low carb.
Keeping in mind the dining common's hours is also important. Ours closed at 7 pm, so I went without dinner a lot of nights. Having good food in your room is a lifesaver for those nights, and also for the nights you're up late studying.
And I second the drinking suggestion. Learning what alcohol does to your blood sugar empowers you to make good decisions instead of putting yourself in danger.
College is great. Don't be offended when she doesn't want to come home for the weekend - it means she's having a good time. One other thing - I wish my mom had made it clear to me that it was okay for my first semester to be a total disaster, for me to feel like i didn't have any friends and to spend 10-12 hours a day sleeping. If I had felt like I could have called my mom and told her I was having a hard time, it wouldn't have been such a hard time. Instead, I'd only call my mom when I was feeling happy, which wasn't often.
That enough for you? ;)