Touche. I think the whole thing with her mom is since childhood so a lot more damage there. Because you can feel/be equal to your partner, but Infront on your parents your subconscious is always just a defenseless child. So I think it's harder to forgive her mother's indifference and favoritism towards Ash.
Maybe because her mother has two remaining children while Winter only have her as his wife. What I mean is, to her mother she is one of the two options, Violet or her brother, while Winter only have one wife, Violet, he will be his one and only.
It pains more when it is one of your parents, she understands her mother's reasons which is why she couldn't forgive her yet, but she didn't understood Winter and I think that's why she was more forgiving. If it was a partner, you'll always be hung up on the what ifs, but a parent's doing is always hurtful no matter what the reason was.
Her mother is insufferable
i find funny how she doesnt forgive her mother but i guess forgives her husband