You are letting her feel the consequences of her decisions and not trying to rescue her any longer.
We all come here in hopes of saving our M. You are in the right frame of mind to move on to better things. I'm sure you still have your moments of fear, doubt and sorrow. That's to be expected. Don't let it keep you down.
I think you are definitely one of the success stories here. I'm not kidding. Love your kids and be good to yourself and be happy. You are well on your way!