Welcome to the forum, Free.
I guess the best thing I can say to you is to love your wife more than ever. Love conquers all things. If your moving away from the cult mentality shows you can change for the positive and love her more than when you were "in" mentally or otherwise, then that would be a fine example of how people outside of their mind control program can be good and loving people without the JW mentality and control. This will confuse her and perhaps make her question why you have improved as a husband since you are exiting the cult. She would see the positive changes.
Also you may want to put forth efforts to pray more and perhaps, not in a showmanship kind of way, but in front of her, to only show that you still love God and believe in Him if, you still do. This will show her you are not leaving God and Christ just because you are leaving the Corporation.
Pray before meals for example and pray for them out loud. Be a good provider spiritualy despite your moving out of the mentality of the Watchtower.
There is nothing more powerful in influencing someone than showing them love and praying for them. Showing that you are doing fine spiritually outside the Watchtower and being a better person for your family is a great example of proving their is success outside the cult.
This approach that I used won two people of my family outside of the Watchtower and into Christianity, and all without a word of argument. As they say, 'actions speak louder than words'.
To keep the peace show that you support her for her decisions to continue in the WT but do not encourage it. Use yourself as a guide for her to follow to become a better spouse and spiritual person rather than a someone that is drifting into unknown territory without direction. However this take a developing a new spiritual journey and a post cult personality. This will be your strongest asset in the long run.
A good example I have experienced is when I was invited to go to a JW gathering barbeque. I didn't want to go but I did it for family. I then would invite people over from my church so that my JW family could be exposed to them.
However when we leave JW corporation we need to develop a new personality and worldview that takes time. Getting Steve Hassan's books as mentioned by other posters above will start this process. I would suggest to read those books.
Peace
Maksym