Agree with everyone on more therapy and perhaps new boundaries. Your post also reminded me of this lovely piece by Esau McCalley in today's NYT:
https://www.nytimes.com/2021/08/21/opinion/pandemic-changes-satisfaction.html
He writes about a complicated relationship with his father, and wrote (movingly), these two things:
"He was like most of us, a mass of contradictions."
"As I grieved, my father’s death brought a certain clarity about my calling as a husband and parent. If my relationship with my dad had been marked by brokenness, I wanted my relationship with my wife and children to be marked by healing."
It's not too late for you and your mom to come to a place of healing, but it's not quick or easy. And you can focus right now on the kind of mother you want to be and can be. That's a perfectly OK priority and boundary for you as you enjoy new motherhood. Peace and healing to you and your family.