You are doing the right thing. How very brave and kind of you too. Continue to pressure for protection for your grandchild whether your daughter sees the light. No child deserves the pain and threat of an alcoholic home. If and when your daughter is ready, there is plenty of help out in the world for her. I would bet she is getting exposure to some of it right now. Stand your ground Sadness and know that its her "disease" that is so angry with you now, not your daughter.
It can be very difficult being a part of someone's "bottom" if indeed that is what it turns out to be. One day, when she has sobered up, she may look back on this as the best thing that ever happened to her. But there is no way of knowing if she will get sober and so this is a "one day at a time" deal, okay? In the meantime, you need to take care of YOU. How about looking into Al-Anon and trying out a few of their meetings? You will find some wonderful, loving support there from people who have been in your shoes. Look them up in your phone directory and call them. Tell them the same thing you told us. You did that just fine.
PS - here is their website
www.al-anon.alateen.org