HI and welcome. It's a long long road you've got ahead, so I would suggest that you take things slowly. About the only thing they can get excited about is their wedding anniversary, so make a really big deal of that every year - she'll appreciate it.
Try to keep her talking about her faith. Think about ways to approach the JW's beliefs that everybody is going to die except them. Ask her about it. She'll deny it, so then ask her why they preach to people if somebody has to be a JW to be saved? She won't be able to answer, so ask her what is wrong with her celebrating holidays if you're all still going to be saved? That will end the conversation, because it's too much for her to think about it. Give her all the time she needs.
The next time, do it all again, but make the point that every day the world's population increases by 210000, but they only baptise 800. Get her thinking about babies being killed by Jehovah at Armageddon. Then remind her that she believes that you are going to die at Armageddon, and does she think that's right?