Understandable. Each relationship is a function of both people and their abilities to have a relationship. I don't know if it's different with a child- as a parent feels responsible for a child- but when the child is an adult, the parent role as caregiver evolves. It's still a special relationship but it takes both adults to maintain. In my situation, it was a mother with BPD- but she would blame me for any issues between us.
I wish I could have "made the relationship better"- but she did have mental health and it didn't seem to help and eventually, I had to accept that the relationhship with us was a function of her ability to have a relationship too and her BPD limited this.
I did try to do nice things for her but for some reason- she'd find something wrong that I did, or didn't do, and the attempts felt like failures. Sometimes even a small thing could be felt as a major transgression to her.
I didn't have any intentions of hurting her and I know you didn't have intentions of hurting your daughter. I couldn't change how she might feel.
However, you also have the right to not be subjected to daily blame and verbal abuse and I had decided this as well. I had to have boundaries on this. It doesn't feel right, it feels unatural. A mother-daughter relationship should not require this. I wish it was different and perhaps she wished it was different too but with immediate family, her BPD behaviors were at their most, and they were verbally and emotionally abusive. I also didn't want to continue to enable her behaviors.
Ultimately, if we don't see where change is possible, we do the best with what we have. You don't have to allow her to be verbally abusive to you. You can have boundaries. Unfortunatly this choice also involves their possible reactions to the boundaries. This can be scary. These aren't choices anyone wishes to make but if it's impacting our own emotional well being- we may have to. Maybe my mother thought I was a bad daughter for doing so, but enabling her to be an abusive person wasn't being good to her either.
Are we perfect parents- or children? No, but we all do the best we can in our own circumstances. You've apologized. Tried to do better. I think that's the best anyone can do. It's up to your D now to accept the apology or not.