GTTM - firstly, don't pry any further into her "personal" notes or anything else for that matter. How would you feel if she started looking into your private stuff?
Secondly, cease immediately telling her anything which points the finger at her precious JW org - she's got the point that you believe they're corrupt. Saying anything else will only dig the hole deeper for your marriage.
Thirdly, If "invited" by the elders to step into the back room for a chat, go ahead - but only to ascertain what's on their minds. Never refuse to hear what they want to say - just don't say anything to answer their questions.
If they want to discuss your wife's list, simply say "Your concern for me and my wife is understandable, but I'm sure you'll respect the fact that anything which my wife and I discuss privately is not up for public discussion - as I'm sure you would both tell me the same if I asked you to reveal your personal conversations with your wives. I appreciate your motives. If I ever require your assistance I'll call you. Thanks."
Their "chat" is crucially to get you to put the rope around your neck.
They have only one witness. They can't do anything or prove anything - so don't give them anything!
Ecclesiastes 3:7 - "A time to be silent and a time to speak."
This is now your time to keep silent - I wish you well.