Hi there,
Sorry you are going through a tough time and no doubt your daughter is living a pretty crazy life right now.
This might not make it any easier to take her behaviour, but when I was at college me and my mates were pretty crazy and drank ourselves stupid many nights. We grew out of it. This was the U.K. but the culture of drinking amongst 18 -21 year olds was rife.
I'm not saying she is not an alcoholic but I'd be more worried if she was hanging out on her own, isolating, manipulating and lying. What I see, and it must break a mother's heart, is a rebellious student, making a mess of her education having a riotous "good-time" with her pals.
For yourself though get some help and you may find it easier to handle.
Take care