I voluntarily left after, well, 38 Years. I truly believed but eventually I realized that something was wrong. They didn't disfellowship me, I just slowly stopped attending meetings over a number of years. I was getting very suspicious of the headquarters in Brooklyn. The Witnesses are totally spoon fed information by their Governing Body in Brooklyn. They will not dispute anything they have been taught as they have been taught Brooklyn gives them all their spiritual food and the Governing Body is appointed by Jesus and Jehovah. (They always have scriptures to back up all of this). In 1975, "They" convinced their congregation members around the world that Armegeddon was coming, but when it didn't they denied everything and blamed it on the over-zealous people in the congregations. They keep changing rules about blood transfusions and what is allowed and not allowed. They discourage their members from getting an education. They won't allow divorce unless a spouse commits adultery or you get abused so badly, you have to prove it to them. The "They" I am referring to is the Governing Body. There are plenty of other examples, but basically you have to do what "They" tell you to do, or else. If you don't, you can be disfellowshippped and your family can never speak or have anything to do with you again. If you do, you will be disfellowshipped too. If you are not one of Jehovah's Witnesses or get thrown out of the congregation, you will die at Armegeddon. If you don't go out and preach and get Bible Studies, you will be accountable for other people's lives. By the way, they have an internal campaign going (again) that Armegeddon is coming very, very soon. This keeps everyone scared and under control.
In short, I had a feeling I was brainwashed, and when I got out and looked back, I was right. So that's why I left.
You could ask her if JWs teach that everyone who is not a Jehovah's Witness will die at Armegeddon. If she tap dances around it, she is lying. Also, Witnesses are taught to get away from anyone that causes doubt in their mind, so be careful or she will drop you like a hot potato.
Please let us know how things are progressing. Every person that can get out of the control of Jehovah's Witnesses will have a better chance at a happier life and freedom to think spiritually for themselves.