Wow. This piece deserves much more attention than it had for being such a important topic for the quality of our relationships and society at large.
First of all, I want to tell you that I am sorry and I truly understand your choice of detaching yourself from your mother.
Our experiences are a little similar however the abuse you received is quite scary and I am very happy for you that you could share it in writing with the world.
I am not there yet as I am still protective of her. However the love/obsession I had for her is for the most part gone.
The boundaries that she now needs to respect are not negotiable and every time are crossed there is punishment.
The quality of our relationships is the best part of our life, therefore the initial print of attachment style needs to be adjusted, in my opinion, in order to reshape a healthy attachment style to use in all the other relationships. Therefore the need to keep in contact and work on together with my parents from afar.
I wish you all the best and great success in everything you do!