C,
Your children have seen way more then any young children should. Take care of you and the kids. She is an adult and treat her like that. Who cares if she is sober or not. No visits alone with the kids. Hit some meetings and give her to God to watch over.
An addict told me years ago," it was the best thing my wife ever did for me by kicking me to the curb" . You have tried everything else my friend, you have nothing to lose, now that she has lost everything.