I'd actually like to go back to KZJW's situation.
Let me quickly share some of my story, which you've all heard before, and then ask a question. When I married my husband, I was Episcopalian and he was Lutheran. We were married in the Lutheran Church and attended services there. They were close enough to Episcopal practice that I didn't mind. After we married, I became Roman Catholic. My husband objected but tried to be supportive of my anyway. Once I became Catholic, I continued to attend Lutheran services with my husband on Sunday mornings and he attend Mass with me on Saturday evening. We were a dual-service couple, which is fairly common in Catholicism.
Here's the kicker. I watched programs on EWTN (Catholic TV) and my husband watched them with me. Every single thing I learned in RCIA (the class you have to take to become Catholic), I brought home the info and shared it with my husband. We looked up everything I was being taught in my Bible, his Bible, the Catechism of the Catholic Church, all of my husband's Lutheran reference sources, and on the internet. When I finally finished RCIA and was welcomed into the Church, my husband wasn't convinced to join but he understood why I joined. Two years later my husband joined RCIA and became Catholic.
So my question is, can you sit down with your wife and ask her to have an honest to goodness Bible study? Actually go through the study book they use paragraph by paragraph and have her try to show you why you believe what she believes and you, conversely, show her why you don't? Maybe she won't agree with you but at least she'd have a better understanding of you and see that you're trying. Here is a link to a website that destroys the What Does the Bible Really Teach book. Your wife doesn't have to know you're using this info.
http://www.catholic-forum.com/members/popestleo/bibleteach.html
Your mistake was not intervening when she first began her journey with the Dubs, but how could you have known? It's much harder now to get her back.
However, if what she has is the Truth, it can stand up to scrutiny. Ask her to do her best, line by line, to convert you and to be willing to listen to your objections with an open mind and heart.
BTW, have you considered an intervention? I know someone who does interventions with JWs, might be able to help you.
StAnn