I read your beautifully written blog, and I cry for you. I am a mother, and know that deep down your mother must be proud of you, even though she is under the immense influence of the borg.
The disturbing thing is that when your parents become older and no longer able to care for themselves, the elders will most surely view their care as your responsibility. I remember reading a very sad post from a person who had this happen to her, and by the time she became an "acceptable associate" to care for her mother, her mother was a virtual stranger.
I would say that you should never give up hope. At one time I was just as brainwashed as your mom, in the organization over thirty years, and here I am now.
In the meantime, you are a credit to your family, even though they do not recognize it.