Most Helpful Guy
You just have to listen to her and be there for her, she just needs a shoulder to cry on. And then you have to build her back up and reassure her that there will be other guys. You guys are only in college and have the rest of your lives ahead of you, remind her of that. Whatever you do, don't put her down and don't make her feel like she's being over dramatic, she's going through a hard time and just needs love and support. As for her college finals, yes I think that's very important and that she does everything she can to take and pass those finals.
Most Helpful Girl
Well maybe it's not JUST the break up, she could've already been freaking out about finals and perhaps other crap going on in her life (just because you're close doesn't you really do know everything in her head) and him breaking up with her just when she was perhaps feeling happy and not stressed about one aspect pushed her over.
We all have periods of time when we're just not good, and the smallest thing like stabbing your toe, paper cut, dropping that shirt you were about to put on makes us want to sit and cry because it's just brought it all down.
If it's just about a guy, she should grow up a bit, but really, time doesn't always factor into feelings. Just be supportive, she's obviously got a lot of stress on at the moment and when finals are over and her emotions aren't out of whack because of it she'll probably realise how stupid she was being.