I would tell her.

Tell her in the most harshly accurate possible manner that you are able to without feeling too overwhelmed.

Make her feel your pain as much as possible. Make her realize that she royally screwed up as a parent.

I wish I had the chance to tell my mother how her antics and her lies and controlling nature made me feel but she's been dead for 4 years now. Back when she was alive I was too afraid to stand up to her but looking back now, I wish I did.

Doing so might also help you heal or at least be very theraputic.