Newborn, I am so sorry you are going through this. But perhaps I can give you some hope. All of my family (from my side) were DF'd at one point except for me. I was very young and really co-dependent with my husband's family who really stoked the fire of my self-righteousness. They and the wts went to great lengths to "encourage" me to stay strong in my rejection of those who had "left the faith." I tell you these things not to excuse my bad behavior, but to let you know what might be going on from the other side.
Obviously, I eventually came to my senses and left the organization when my own children were harmed by a pedophile relative from one of the good witnesses on his side of the tribe. When I saw how that situation was handled I began to see how wrong some of the wts teachings were and after struggling with it for several years, I left. My reason for telling you all this is to show that you can't know what might happen in her life to open her eyes to the truth about the so-called truth. Leave her alone for now as she has requested and simply wait. I know it's hard for you to do this, but perhaps in time things will change.
Those who have already posted here and said it will take time to recover from the wts are correct. Hang on though, and in time it does start to get better. Support communities such as this one can do a lot to help you along. Just reading the experiences of others on here has been a great source of comfort and encouragement to me. You are not alone Newborn and this group will be here to support you.