I would try to get the emphasis of the relationship off of "you VS. Jehovah" because that's exactly the kind of martyrdom attitude that Witnesses are taught that should convince them they're special to God, and have the "Truth".
I would put it on a level she will have to respond to if she is a "good" Witness, that the WTS asks that women respect their husbands, regardless of if they are worldy, disfellowshipped or inactive.
Tell her the publications suggest that a woman spend an adequate amount of time with their husbands to facilitate a healthy marriage. Remind her that recreation is also recommended by the WTS to be a balanced Christian.
If you're in a contest of wills with a Witness, my long experience tells me to use their own words to fight with. They constantly recommend being reasonable and not fighting, but being quietly persuasive with reason.
Of course, you can't teach their BS with reason, because it's circular logic and not all that reasonable but that's what they think are the rules, so use their rules.
I actually once did this in an elders meeting, kept writing down the "advice" the brothers were giving me about being reasonable (they love it when you take notes of what they say and what scriptures are used) and then when things got a little heated because I started asking questions that made them squirm and finally, pretty pissed, I just calmly read their words back to them.
What could they say to that? "I was lying when I said that."?
Your wife is a nice person, because nice people are the kind of people the WTS more easily sells on their ideas of peace and utopia. Everyone reasonable wants those things, duh.
Just agree with her when possible and stop asking those "what if?" questions that are making her uncomfortable. You have to give someone a bridge to another reality where they feel somewhat secure before you can pull the foundation of their beliefs out from under them, regardless of how ridiculous those beliefs seem to you.
Say and ask things that will gradually make her realize that there is more to existence that is pleasant and good and peaceful than JWs. That's what she wants, she's just looking for it in the wrong place.