From experience, I left when I realized things were never going to change. I tried for many years but things got worse, not better. I gave it my all but when a person becomes consumed by their addiction and chooses to stay in it, there's really nothing else you can do but to pray for them, prayer being the gratest blessing we have.
If she's still drinking after taking the program, then she's in worse trouble than that particular program can help her with. She has to want to do this. Do you have any idea what caused her to get to that point? Any issues from her past or her childhood? Has she sought any other kind of counseling? She may needs several kinds of counseling to get her through this, for example, individual counseling as well as couple's counseling, AA meetings, self-help books and articles, a support team, church, reading the bible & articles, plenty of prayer for herself and a will to want to stop.
If she doesn't believe she has an issue, the issue cannot be resolved. I learned that the hard way and you have to see the truth in that. I came to the realization that there was nothing left I could do - I saw what a toll it was taking on me and my family and even on him. I put my own feelings aside and considered everyone else, in that I walked out. I dont know if that's the best decision for you but I know it was for me. When someone has a problem like that, you have see what it's doing to you - is it worth it to stay and continue trying to help or is it time to go?
Pray on it - pray and ask God to guide you in making this decision. Ask Him to clearly show you, to speak to you - He'll answer, believe that, He'll answer. Break everything down, the specifics, take it all into prayer - it's not an easy decision but you'll be sure of what you have to do.
God bless you.