Glad to hear that you guys managed to get through this. I know crap like this happens more often than anyone would think, and more often than not, this sort of situation is the sort of thing to completely destroy relationships. I'm glad to see that you guys have managed to become closer thanks to this.
I will say one thing though. You might want to be careful about alcohol now. She seems to be completely turned off of it, and personally, I think that's a bad thing. How will she react about you drinking, or other people around her drinking? How will she react if she's in a situation where people are drinking around her and offering her booze? An experience like that can traumatize someone enough to make them react ways they normally never would in situations like that. By the sound of things, she is blaming alcohol, at least in part, for what happened. That's not a good thing. She needs to realize that Cassie is the one responsible, and that alcohol was simply the tool she used.
Sure, there are dangers to alcohol, but alcohol can also be a great way to have fun, let loose, etc. etc. and I would hate to see her completely turned off alcohol for the rest of her life because of some experience like that. It'll likely make her life harder for the next couple years (until she's in her mid 20's or older) when alcohol is a rather large part of many people's lives.
So I'm just giving you a heads up that she might be awkward and may even react in ways that you wouldn't think in situations involving alcohol, and that you should definitely watch that. If she does have a big reaction about it sometime, you may need to try to explain that alcohol was simply used as a tool. And that she shouldn't blame it at all for what happened, however much she may want to.
I know that is something you may not really want to deal with now, but I honestly think that given some time, you should try to address this, because it's not good to see someone who could possibly enjoy alcohol turned away from it because of a bad experience.
(Most people have bad experiences of some sort from alcohol, at least once. I've gone to the hospital with minor alcohol poisoning before, and didn't drink for about a month after. but that's over with, I paid for it, and I'm over it. I don't blame alcohol for what happened to me, I blame myself, and to a lesser extent, my friend who egged me on, but the sole responsibility is at my feet. I drink beer mostly now, because I know I'm not good with hard liquor. I learned a lessnon about drinking that night, and instead of staying away from alcohol all together, I'm putting that lesson into use every time I drink.)