Ah, then it sounds to me like she's saying "we need to study and get back to it," like I say, "I need to clean out my closet, and sort through my papers." It's something I know I should do, but don't want to do. It's not even that important to me, really. But it creates stress when I look at it, and makes me grouchy.
My approach is to remind myself of the other important things that I've done or are more willing to do... like classwork, cleaning the rest of the place, etc. And I also just get out. Find things to do outside the routine that readjusts my perspective. Then I think, "I should clean out my closet sometime. At the latest, it will happen when I move. So it's not that big of a deal."
Perhaps rather than sitting down to a boring bible study with the kids, it would be more productive to just spend time with them doing active things that they enjoy. If it's a case where she's actually thinking, "this current routine just isn't doing it for me." Going back to studying and the JW stuff isn't going to improve things. Maybe it's a case where she needs a break from the kids and would like to do something with you... or dare I suggest without you and with her girlfriends...?
Since the scenario isn't what I imagined it, you still have a lot of freedom to speak with your wife about things. I'd suggest not talking directly about JW stuff, but about other things that will make her happy, rather than stress her out during this holiday season.
. But I digress...