I hope for your family's sake, she stays "not drinking" and finds a solid program to work on her issues. But from my experience, when someone stops drinking to prove a point to someone else and as a measure of punishment and control - it rarely sticks.
I went to counseling to try to deal with my marital issues. Luckily, the counselor had a background in addictions and knew that one person can't deal with marital issues alone. He called it ' one hand clapping' - it just doesn't accomplish the desired end goal. However, he took the time to help me, which is what I really needed at the time. I hope you find the same help with yours.