I see your point. I thank god I was diagnosed and now medicated to control my PTSD. Way back when, I was drinking and drugging and that is the same atmosphere my kid was raised in too. Except, I look at it this way, PTSD raised my kid, not me. I've told her that and validated her feelings and accepted responsiblity for what happened to her. After all, ill or not, I am the one who caused the damage.
Now that I have a handle on things, hopefully she will get to know the real me--the one that is responsible for her issues, the one who is really a very nice person and someone who has always loved her. I also hope she sees that I am now a responsible adult and not that drugged-drunk she remembers.
I hope someday you and your mother can smooth out the relationship between you, to a level you can handle.