Being an unbelieving mate is always tough duty.
You are married to someone who is absolutely certain that she has the truth. You therefore by rejecting it, can only then be ignorant or evil. You have to then prove that you are neither.
I do this with all the dubs in my life. It takes a little time but they learn to back off and respect you. You do have to show that you do believe in God, and the tenets of Christianity. You have to be even more committed to what you beleive than they are. Be a BETTER christian than they are. This is just for show mind you. I don't think that such metrics should be applied to our faith. But it is important FOR THEM, to show them that you can be a very decent person without being a jw.
There you are, demonstrably, not evil.
Now to prove you are not ignorant; pick a subject, any subject. Preferably find some subjects that you can REALLY clean a jw's clock on. Blood is probably the easiest mark because it is just so ghastly, awful, and completely WRONG from the standpoint of the scriptures. If you need help with that let me know. I have a write up of 41 questions on blood that has really gotten quite a few dubs to back off with their two-bit, snobby attitude.
Now that you are armed with a few very understandable subjects that force you to reject the jw as a matter of CONSCIENCE. Simply reiterate that theme, time and time again.
Most importantly, you must check your attitudes. One of the hardest things to do is to be RESPECTFUL of your wife's beliefs. But that is the thing. If you want her to give you respect, you have to respect her. And that goes with all JW. Yes, I think they are a cult. Yes, I think my wife is under mind control. But I dont' come at her that way. I simply have given up all my resentment towards her for being a jw. I respect her, and I know her faith in the jw is very important to her. I wouldn't want to hurt her in any way. I do hope that she is able to overcome this spiritual addiction, but I also know that I have NO CONTROL over that outcome. I counsel, I provoke thought, I never try to disrupt her beliefs. If she is ready to question, she will question. And I will be there to help. She will have no shame, or regrets, or I told you so's coming from me.
Just some fuzzy, 5am before my coffee, braindroppings.