I have just one thing to say
Your sister is being brainwashed, and while I believe she is responsible for what she says and does, the people who are “training” her are very good at this. My mother elected to go to a “training” weekend with her upline as opposed to supporting her son who was in the hospital, trying to get over a crippling illness. Her justification was there was nothing they could do to help anyway and missing this weekend retreat could set their business and our future as a family back. I’m thinking her son did not want to hear that.
I would say do not allow your sister the luxury of getting away with treating you that way. Do not support any form of her business. Draw some very straight and deep lines in the sand and do not let her cross them. I believe eventually she will come around, then you can be there and hopefully get back to where you were. Love does find a way in families. Good Luck