I feel for you because that is the exact same thing we've been going through. I know you want to try and explain it to her, but she really won't listen or understand. Just before I stopped going to meetings I called my long time childhood friend and just put a few feelers out there to test her out and she was so mind frelled by the WT, it was so sad.
I know its hard because you want to try and still be friends with the person but as long as WT is there, there can ever really be a true friendship there. I learned that the hard way with another friend of mine who is actually my cousin, I hated to hurt her, but I had to cut all ties because I knew she just wouldn't understand. Plus when she finds out I'm an apostate she would have done the same thing to me.
Maybe what you can do is write e response but don't send it right away.
Peace.
Gojira