It's v.v. difficult dealing with narcisisstic parents, mostly because they are the antithesis of everything (I think) parents should be. The world, and all in it, is relentlessly, unremittingly about them. You have to learn as an adult that you are entitled to a voice as well.
IME, they constantly move goalposts so you feel you are on shifting sands and have no idea how to please them. The truth of course, is that you cannot please them and stay anywhere near sane. They will bleed you dry of emotion, time, energy and hope.
I'm not sure you ever "come to peace", but you can learn to live with it, if you want to.
I have no expectations of my mother at all. None. I have learnt to stop wanting to please/appease her and to conduct the relationship on my terms.If she starts with the madness, I walk away and re-enter at a time of my choosing.
I am vigilant and stingy about her access to my son, (not that it is difficult,she doesn't actually want to see him, she just wants to boast to others about what an outstanding grandmother she is. He doesn't exist to her as someone in his own right, he's a cipher), and ensure that she cannot develop a relationship with him that can harm him. For example, she has never, (and will never), been left alone with him.
I would cut contact altogether, but it is difficult on a number of levels. There is a small part of me that would still feel "guilty". As inappropriate as that is, I accept it and work with it, as long as I am no longer damaged by it.
In my eyes, they are dreadful, dreadful abusers and to saddled with one of these types as a parent is awful, as the legacy they leave can be devastating.