My best friend was raped: what can I do for her?

First off, thank you for this site. It's wonderful. Now, I'm a just-graduated senior, and my best friend went with a big group to Florida for their senior trip. She called me wasted and crying, upset and saying that this guy I'll call E wanted to have sex with her, she told him no, and he did it anyway. His side of the story was that she didn't protest. Sounds like rape, right?...