You cannot change her. I am married to a Heroin addict who has reached the point of recovery. However, if he slips back into addiction, I could do nothing. I am powerless over his addiction. It has nothing to do with me. I did nothing to cause it, and I cannot cure it. Same with you.
If you stay, you will be pulled down the rabbit hole with her until she decides that using/drinking is harder than sobriety. You will lose control not only of her, but yourself. She is aware sobriety is there for her. She knows there is help, you can't make her want it.
Love her from afar, pray for her, but take care of yourself now.