That is a really rough past that she endured. It definitely puts things into perspective. Not that it justifys her treatment of you.
We dont get to chose much of the adversity we face in life, but we do get to chose how we grow and evolve from it. Sounds like you are taking the steps forward in healing and growth that she did not.
Here is her birth chart, it shows a snapshot of the solar system when she was born:
As I mentioned earlier the 90 degree angle formed between Gemini and Pisces can be very disharmonious, especially in relationships. (90 degrees is the most disharmonious angle). There is one other sign that Gemini forms a 90 degree angle with, that sign is Virgo. It would be disharmonious if just her sun was in Virgo, but she also has her Moon, and a Mercury there as well, that really amplifies things.
Unevolved Virgos are stereotypically known for being perfectionists, fussy, and hypercritical. If you felt like nothing you did was ever good enough in her eyes, it probably was not. In bad and ugly cases this personality trait can manifest as taking pleasure in ‘cutting’ people down. Sounds like that was the case on her death bed when she said those nasty words to you.
Evolved Virgos look like Mother Teresa, using their talents to help the vulnerable.
Here is summary analysis of that sun moon combo:
Not always the most pleasant to be caught up in the scope of a ‘Sharpshooter’…
You were delt a rough hand astologically speaking, any child with a mother or father who has a 90, or 180 degree angle between them, can lead to a lot of hardships growing up, and beyond.
I hope this brief summary helps. I found learning astrology monumentally helpful in my own spirtual path. If you are looking for more closure on this, you might try to consult a reputable astrologer in your area, or go to the library and check out a few books. Linda Goodmans Sun Signs is a classic, but a little dated.