Oh lordy.
Best thing you can do is educate your DD through counseling and extensive knowledge about addictive behaviors.
I agree, detatch. I did, for my own sanity. I just had to go pick up my child from my X's house last weekend b/c he was drinking w/her there. I did not engage one little bit. Just put her in the car and left. He knew why, no explanation needed. I don't speak to him about anything except what is required. It has saved me a lot of anxiety, that is for sure.
Many, many hugs.