I don't know anything about your sitch John but I'm glad to know their can be positive outcomes no matter how things go. Good for you.
I have no clue of your history or how your ex is but it sounds like she is in a bad place. However, and I'm not saying you are doing this, I think it is important that our kids have as much a relationship with both parents as long as their safety and behaviors are not affected too negatively which in your case sounds like they could be.
Hopefully she'll turn things around at least for your child's sake.