I am not sure if someone else has said it, but I would stick as closely as possible to the Bible if I was pointing something out to her that is contrary to witnesses. You will need to do a lot of research. You may need to get out the kingdom interlinnear somewhere down the line. But use the Bible. Eventually you may be able to show outside research from random websites (not apostate anything, ever..until she's well out mentally.) Be slow (I know it's hard! You want to start living your own life finally!!!!) but be slow, or your family will be more jeopardized.
It seems like there is much more glorification of the GB since I've left, their word seems to be considered on par with the Bible now, so this is going to be tricky.
Maybe more than specific doctrine, tho, is a change of outlook. Opening your eyes lets you see people in a different light. You see the genuineness and goodness in people who are not witnesses. Maybe make comments to your wife about people who you know who are good people who are not witnesses, and share a more positive vibe with her regarding living in the here and now. And most importantly, shower her with attention and affection, so she never needs to doubt that you love her.