Thanks so far for the input. I did suspect there was something up the last few months since their last DC as she has being rather cold toward me. I also suspect some family members might have being pressuring her to.
Her explanation is that I was baptised at one time and know what is right and wrong, even though I have not being attending meetings for the past 15 years. The way it was worded it sounded like she was getting advice from someone else. I am at a point where I don't care if she ever talks to me again when she puts the cult over her family. So I will add I do not take well to emotional black mail and passive aggression.
Even my GF doesn't understand why they are doing this and recognizes this as cult type of behaviour. She said to my sister, this is not the way of love and all you are doing is pushing your brother away even more.