Oh darlin', welcome to our world. There are several of us with NPD parents on DCUM, so you'll find understanding here. I've known about my mom's diagnosis for about a decade. Here's what you have to accept: she will never change. So, your choices are to move on and live your life without her or to find a way to live with it. Only you can decide what you can tolerate and what's right for you. There's no one right answer. For me, the right decision was to try and find a way to live with it. I found the tips and tricks in this book to be helpful (
http://www.amazon.com/Children-Self-Absorbed-Grown-Ups-Getting-Narcissistic/dp/1452654263). We still definitely go through phases when things are better and times when they are not. I just try to stick to my boundaries and if I need to limit contact for awhile during a nasty phase, I do. Time heals a lot. But it's a life-long struggle.