I don't think it was AA that killed her marriage.
It was "responsibility" that killed their marriage.
when I was single, no kids, I felt free to roam the earth as I please without any fear for my life.
Once the kids came, I was "grounded" to live a "normal" life. School, work, clean, cook. Next day, same again. I had fear that I never experienced in my life. Fear that if anything happened to me, who would take care of my kids.
Then, ten years passed and I realized I was on the same treadmill day in day out. There's no more freedom after kids. It's a sobering reality. You have to sacrifice all you want to do, for them.