Originally Posted by
OldPaint 
I've told her in the past that if she drinks I will not stay with her. That got her to stop for several years...now she has slipped back. Do I use the same approach? Is there anything I could do to make the "quitting" actually stick?
She is an adult and it is her choice whether to drink or not.
Do not say anything unless you mean it. Be prepared for her to choose the alcohol over you. Mine did more than once.
There is nothing you can do to make her quit. You can only protect yourself from her choices.
L