emski have been thinking about your post earlier. I had a terrible relationship with my Mum from about the age of 10 until my early 30s. I grew up feeling I'd always disappointed her, her disapproval became the reason I had to do or not to do most things in my life. She was what would probably now be called emotionally neglectful.
It changed when I had S, but our relationship slowly began to improve because she changed. I for my part also changed and no longer gave her the power to make me feel like shit. I stopped trying to win her approval and just let her get on with it and if she wanted to see me, she could pick up the phone.
I think that she may have got some help herself with regards to her own feelings, disappointments in her life that caused her to look at how she treated me growing up.
I'm not really sure what I'm trying to say but you need to do what is best for you. Persevering with an unhealthy relationship be it with a parent, sibling, partner is not going to suddenly get easier or better. You are always going to hurt because of her treatment of you, so if she is in complete denial about your feelings, emotions I'd be tempted to scale things back and slowly withdraw.
For what its worth my Mum has never fully acknowledged how shit she treated me but sometimes I can see her look at me and I know that she knows.
Apologies if this is all a big rambly, unhelpful mess but I'm on my phone and can't preview that mixed with fat fingers probably renders my spelling piss poor as well