Hi Hurting! Welcome.
As an ex elder and long time jw (50 years plus if you count childhood) I have come across many strange characters, vulnerable people even crazy and twisted people within the walls of the Kingdom Hall.
But the description of how your twisted and crazy mother treated you kids is up there with the worst. I dread to think what happened in her life to make her such an awful parent.
I mean getting sisters to come round and beat you? Am I reading that right? Sounds almost (but not quite) like the lovely "Eunice Spry" from Gloucestershire, England who was able to hide her wickedness form other jw's and "worldly" authorities for so long.
She's even got her own wikipedia page bless her ...
Anyway I've gone on a rant. I am sorry and I would like to say you are very brave posting here and we on this forum wish you all the very best in your future life.