My husband and I separated over 2 years ago. My children are now 15 and almost 11. They both see a counselor at least twice a month, more if needed. It pains me that I didn't get out of that unhealthy situation sooner and they have been hurt because of it. Therapy is helping, but the biggest thing I think that helps them is the changes in me.
My advice would be to shop around until you find someone who not only treats children, but understands addiction and codependence. Also, it is very important to have an open line of communication with both your daughter and the therapist. And listen to what they say. A lot of times, I don't like hearing the things the counselor says to me regarding my children and my behavior. I'm still learning, too.
Good luck to you. You sound like a wonderful, caring mom who only wants the best for her kids. Welcome to SR.
L