I'm so sorry you have to go through this. You have found the right forum, it has a lot of info and compassion. Read through the stickies at the top of the forum and some people have blogs that tell more about their struggles, found under their names to the left.
Do you have any minor siblings still left in her care or are they older now? That is always a dilemma. It sounds like you have made NC work for you when you needed it. I found even better is emotionally disconnecting. It's like watching a video of a storm but not being in the storm when parents and siblings act out on me. I'm there but I'm not there. I care but it doesn't consume me with panic and guilt as it did when I was younger and just starting this journey. I was the one that did all the babysitting and caring for everyone. I still am the one that gets the desperate calls but they are on my terms now.