I DON'T AGREE that JW's can't think. The fact that there are so many waking up shows that they can! =)
The tricky part is getting them to think. The recent ARC, the Candace Conti case, and other sex abuse scandals got many thinking. I believe that almost every JW has the potential to wake up, but in order for them to do so, something has to trigger them to start thinking first
We were all triggered to think by different things. For me, it was mainly the blood issue, sex abuse scandals, and not being able to get over the fact that God will destroy billions of innocent people at Armageddon. Others are triggered by false prophecies, 587 / 607 B.C.E., 1914, 1975, overlapping generations, the Mexico / Malawi scandal, the UN scandal, injustice in the congregation, the disfellowshipping of a family member or close friend, being disfellowshipped and shunned themselves, being stumbled by Anthony Morris or other GB members, unfulfilled expectations such as Armageddon not coming, something a householder said, stumbling across something online, etc. What works for some might not work for others. Every individual is unique in their thinking!
The most important thing is NOT to give up on such ones. There have been many experiences of ex-JW's on this site who were highly indoctrinated, but eventually woke up because their spouses / friends did not give up on them. Hopefully one day, your wife might be one of these ones!