Parents with cPTSD, what do you do when your own parents are your only practical support?

Parenting with cPTSD is so incredibly isolating and difficult. I would love to hear from anyone else in the same boat.

I'm particularly interested to hear from anyone who allows their parents contact with their child. My Mum visits once a week. She is pretty useless, but it means I can catch my breath, do some housework, sit down and generally gather myself whilst she amuses my daughter, who adores her. Daughter is too young for me to explain my cPTSD and my Mum's role in it but old enough that suddenly cutting contact could be traumatising for her.

I experienced prolonged emotional and physical abuse as well as psychological manipulation, compounded by both parents' alcohol abuse. My Dad was the primary proponent of the physical abuse and he is now deceased.

Mum is sober during the daytime and appears an outwardly normal, even nice, person and superficially speaking she is great with my daughter. I have begun to notice some of the same emotional invalidation that I experienced e.g. when my daughter falls over or gets frustrated, and this troubles me.