Family Issues Support Group
Family issues is a huge range that go from minor conflict to major misbehaviour and even abuse on the part of individual members of the family occur. Whether you feel you are in a dysfunctional family or you're dealing with a very specific issue, this is the place to talk about it and find others who might be going through the same thing.

Although you mean well, this codependency will not assist her with sobriety.
She will only get clean when she wants to.
"......I am going through what I know I should ignore, feeling left out, feeling last on the list of her priorities, getting overwhelmed with resentments toward her."
Your feelings are important and not to be ignored.
Contact any number of social service agencies out there who can direct you to proper help. You can find them in the phone book under counceling. I know Catholic Social Services is one agency, and there are others.
I would sit down and talk to her about this. Your mental health is just as important as hers is.
I hope that you find some piece of mind soon. just be there for your children, during this time you are going to be very needed.
Question: Did she want to go to therapy or did you give her an ultimatum? I don't want to assume she went against her will.
With or without her I need to get myself back in order, I am going to attend my first Al-anon meeting tonight.