Hey M. I saw your latest post and just wanted to say you continue to do an admirable job of managing your sitch.
Regarding the frustration of your mom helping out, I've faced similar criticism. It's like if you find a more creative solution than W did, or have a better support network of family and friends, they resent that. Or, accuse you of being a bad parent for shuffling your kids off to a grandparent's house. My W actually told me once that I "should have to sit in the house and suffer like I (W) suffered" in a similar situation. Great of you to focus on the outcome that was fine for you and your child. W is likely also looking for a reason to fight and continue blaming you for the overall sitch. As you figured out, there is no value in debating. The post-drunk incident sounds like a similarly sad attempt at being blameless and hurting you. Well done sticking to facts and saying little to nothing else.
I'm glad you're doing well and staying active. It really does help. Not sure I can go alcohol free BUT maybe I'll give it a whirl!