Somebody will be along to talk about this in awhile...
...in the meantime, welcome to the boards. Read many of the stickies at the top of the page, and maybe do a search on "alcoholic daughter" and see what threads come up.
I have a 15 year old daughter who has tons of alcoholics in her gene pool. I may be, someday, where you are now and I feel for you greatly.
The only advice I have to give is for you to find yourself an Alanon meeting and see what it's about. It saved my life, and I know many people there who have alcoholic children.
Good luck,
Cyranoak