Did you ask her what secret sins she thinks you were harboring or anticipating? She is afraid that you have a valid reason, and that she will be shunning you for no damn reason, so she needs to think you are up to something evil to justify the evil that she will be encouraged to do you: shunning.
I would just ask her what unscriptural/unchristian activities she thinks you are up to. If all she has on you is that you go to church or something, then maybe you could encourage her to consider how that is forbidden by scripture to associate with others who serve Christ.
My heart goes out to you. I'm also the child of a JW who knows she can't think too hard on this stuff or her brain will implode. It probably physically hurt her to have her 'faith' in the org. ripped out from under her.
Good luck, friend.