Sounds like she was struggling with some demons of her own. That is no justification for her behaviour though.
I am a mother with mental illness and I hope I never treat my daughter with such…unexplainable heartless behaviour.
You’re an inspiration, you’ve dealt with this quickly, I am sure there will be days it does get to you greatly, I hope these days are few and far between.
Thanks for posting. Hope it gave some insight writing it all down. Hope your mother one day gives you an explanation.