Thanks for your story.
It seems as though once her parents realized that you weren't going to become a convert to JWs, they dumped you, instead of feeling that you are part of the family. I am so sorry for that.
On the upside, why don't you and your family go on a vacation all together to someplace fun for the whole family? You will be making memories with your children, and may be able to have good times with your wife that don't involve JW speak of any kind. If she gets away for awhile, and really has a chance to relax, it may help both of you.
Little by little, maybe you can win her over with kindness!