I'm with Delilah and some of the others on this one. This is a very blatant attempt to manipulate you into doing something she knows you don't want to do. Shouldn't she be the one who feels guilty for trying to twist her husband around her little finger this way? Here you are, driving her to the meeting and supporting her--despite the fact that you disagree with her beliefs--and she can't show you the same respect? This sort of manipulation is very disrespectful of you and you don't deserve it. Don't you feel some outrage over being used this way?
No one is perfect and I'm not trying to pick on your wife or anything. But people who do things like this don't do them for you. They may tell themselves that--they'll surely tell you that--but it just ain't so. She's doing this for herself. I know, because I'm also married to an active Witness. She just wants you to go to the meetings so she'll feel better about things, even if it's a your expense. She probably feels guilty that she hasn't somehow converted you already, and seeing other wives with their husbands at the meetings makes her feel kinda lonely. That's understandable, but it doesn't justify her doing this to you. Many Witnesses are lucky to be married to a non-Witness spouse who just stays out of their way, much less one who supports their WT activities because they respsect them as much as you do your wife. She is making you responsible for this, but you are not the one doing this to her. She is doing it to herself. She is responsible. Don't let her use your love for her against you.
I don't know what she knows about your feelings regarding the WT, but I suggest you have a talk with her. Be straight with her on the guilt mongering if nothing else. It'll shame her, just a little, to realize that you know exactly what she's been doing all along once you say it out loud. Instead of avoiding the issue the way people often do, tell her you don't like it or appreciate it and why it's wrong. Make it a heart to heart. That should be the center of the discussion. Don't let her make it about Jehovah or the WT or anything like that. It's about how she treats you, despite how well you've treated her. And "I'm doing it for Jehovah" doesn't wash. Make it clear that you're holding her responsible for her actions, not Jehovah--she can't argue too much with that. That may be enough to get her to back off.
If all else fails, show her some articles about wives who nag their husbands. She can't argue with the WT either. :-)
IsaacJ