Physical & Emotional Abuse Support Group
Abuse is a general term for the treatment of someone that causes some kind of harm (to the abused person, to the abusers themselves, or to someone else) that is unlawful or wrongful. No one deserves abuse, period. Abuse can be emotional, physical, or sexual.

There is no way to "reach" your mother.
I'm glad you have a therapist to support you.
My suggestion is to get yourself out
of there into your own place. Once
you do that, MINIMIZE interaction
with your mother. When she interacts
with you with disrespect. . . LEAVE.
There's no reaching her, teaching her
or changing her. She'll always do to
you what she did to your father and
now to you. You're best bet is to
not be around her.
Take good care of yourself.
I never "reached" my mother either. The only thing I could do was walk away when she started in on me.
I have come to terms with this now and see it as her loss if she never got to know the real person I am.
The abuse was all about her issues and her bad behaviour and not a reflection of me. I can believe this now deep in my heart.
You still might fare better with your Mom - who can tell. I suggest building yourself up regardless and always believe in yourself.