(Disclaimer - was raised by maternal aunt)
KalSkirata - I can't answer for anyone else here, but I got to the point of not caring about it by realising that her behaviour was/is game playing & manipulation, done because she could do it.
She wants me to be upset. She wants to guilt me into behaving in the manner that she wants/approves of, and will use all and every method she can think of to achieve that....because deep down there is a part of her that needs/wants to see me upset/in tears/being an 'obedient child', and that part is what drives all her nastiness/madness.
She wants as much power over me as she can possibly get, because it's fun for her. When I finally realised (over a long time) that this was what she was up to, I became determined to reclaim my personal power from her.
So, I ignored the 'silent treatments' that she loved to dish out. I took the sly comments innocently, and refused to rise to the bait. I used to practice saying stock phrases into a mirror before I used them on her.
Then dh and I got married and she went a bit weird (more than normal), and because downright abusive. We are now no contact, and have been for nearly 10 yrs.
She's attempted contact once or twice, but has made a couple of unforgivable comments/actions and, tbh, I wouldn't give her the steam from my pish.
I've finally realised, after a long time, that she's never going to approve of me, or who I am, what I do, my dh, dcs, job, dog, etc etc and that I don't want her approval now I know what a toxic person she is.
And, after all that time, I still get ragingly angry about it all.