There are cheaper options than a lawyer to access help and therapy. Lawyers charge 200+ an hour (sometimes WAY plus). I wouldn't use a lawyer for anything other than LEGAL advice. As Latte mentioned, SOME of them know that kind of info, many don't, and there are cheaper, more well-qualified people who can direct you to therapists, etc.
Bob, I totally get the frustration, but any attempt to solve your problem by treating her like an unruly teenager is going to backfire. It will not have the desired effect on her, and it is likely to have severe negative consequences for you and your son. What you are talking about are power and control tactics, which ARE considered abusive--exactly what you didn't want to be accused of. You may not LIKE the fact that she has a right to drink in her own home, but she does, in fact, have that right. An all-out battle of wills between the two of you is likely to be more damaging to your son than the alternatives you are trying so hard to avoid.
You're also forgetting/underestimating how powerful alcoholism is as a disease. This isn't a simple behavior issue, like not picking up socks or leaving the cap off the toothpaste. This is something an alcoholic is COMPELLED to do. And until she is truly ready to quit, she will find a way to do it. In addition, trying to force the situation (outside of the context of a carefully planned intervention) is likely to make her feel even more justified in continuing to drink.