There is a lot of literature about recovery from addiction. Two of my favorite memoirs are Caroline Knapp's Drinking, A Love Story and Mike Doughty's The Book of Drugs.
Alcoholism does run in families, and you are very wise to stay away from alcohol. I wish I'd been as smart as you when I was college age.
My state school had a sober dorm and there were several sober student groups. There is plenty to do without drinking.
You may also appreciate the book Adult Children of Alcoholics by Janet Woititz. It was a real eye-opener for me.
To say something different from what others have, I'd recommend reading a book on communication like Crucial Conversations. This would help each of you understand your perspectives better and make your own case more effectively.
Ultimately, the only person you can control is yourself. It might be easiest to just accept your girlfriend for who she is. Drinking is very common and for most people tends to die off after they are college age, so recognize that too.