I'm sorry for your pain. Isn't amazing how dubs can leave the cult then come back in full force and act like self righteous bitches - your words :) ? You would think they would be more understanding and some are but it seems like far more prop themselves up on a pedastal. It is very said and infuriating especially when it is family cutting ties.
I too hope your sister comes to her senses one day and you both are able to laugh about it all.