I think I will need to take a break from reading the posts here because when I read the idiotic stuff the organisation does it makes me so frustrated that I can't get through to her. I am bereft.
I can totally relate as the same thing use to happen to me. I would read crazy things here and get all frustrated knowing that my wife is in the middle of it.
You are pushing too hard but it is easy to see how it can happen as it has happened to me several times in the past four years. As others have said, unless you know why she is a witness it will be hard to get her to choose to leave the religion. I can relate myself as I have found it difficult to reconcile my emotional reasons for wanting to remain a Christian and my logical reasoning that ultimately tells me that there are a lot flaws in the belief system (some of them potentially damaging). You may not have the benefit of this kind of empathy for your wife but even if she sees the flaws in her religion, she may still have a hard time leaving it.
My wife, for example, does see certain flaws but remains steadfast because she does not see any other religion or group offering her what the witnesses offer. She also has strong family ties to the religion, most noteably, her religious and devout mom who she does not want to dissappoint. I think she has lost herself in the demands of others and says that she is now "doing new things" by trying to assert herself. Sadly, however, she still does not want to offend the witnesses too much.