I would be cautious because she said "she's put herself out there for you" and based one what you said, she put herself at bat in front of the Elders and CO. That's not easy to do unless she really loves you and believes in you. Based on the information you provided, it seems she believes you are sincere, and really loves you.
Normally, I'd say to lay it all out there, but just based off your post, I think she's got a real shot at seeing the truth if you are patient. You've already been an "unbelieving mate" for several years and she's still defending you...
Having a meeting with the Elders is problematic. Your are going to lose with them regardless of how well formulated your arguments are, and regardless of whatever assurances they gave her, they are lying and will still DF you if they don't like what they hear. You could possibly gain with your wife when she sees they have no answer for your doubts. Or she could side with them and cut you off completely.
You're in the position that you almost have to meet with them. If that is what you decide, you need to keep the discussion on your predetermined talking points. Don't let them dissemble, and above all, don't raise your voice or get angry in any way. Let her see that you have honest questions they cannot answer.
(I just read Sinis reply) I'm inclined to go with his advice. Since you've already been "opposed" for several years and based on what you said, it seems your wife loves you perhaps more (or at least equally) than she loves the organization. If you're patient, and she really is truth-seeking you might be able to win her "without a word", just off your actions as a good husband.
Tough call, and I wish you luck.