I'm curious - was she a JW when you married her? If she was, didn't your priest advise against the marriage?
If she was a Catholic, where were the priests when she started her "free home Bible Study"? How long has she been a JW now?
Personally, I'm an atheist, but there are former JWs on here who have returned to the Catholic Church; maybe it would be helpful to you to get a dialogue going with some of them.