I'm in the same boat - my wife is nearly always tired, she complains that she has no time for anything - yet she spends in average about 2 hours a day for the service of the Corporation. She even wanted to start pioneering, and was extremely upset that I objected on grounds that she herself said almost daily that she has no time.
As said by Black Sheep, they are trained to not listen to anything critical. A couple of days ago it was really freakish, we had a friendly talk about how we should know an advice from the GB was really God's will, if they changed the advices over the years, and as we know God's will won't change. After a while she tells me to stop with this, now she feels that she has to study a lot to repair the damage I've done. The mind control is so obvious, it smacks you in the face.