I tend to see this more when they come back from the conventions. I remember after the last one I attended, 2015 my brother in law telling me on the Sunday evening that he's going to quit his job and pioneer, and he was full of euphoria. Not surprising due to the around of propaganda videos they show nowadays.
If your PIMI wife stopped attending meetings for a while, perhaps due to a long holiday abroad she'd also gradually become a different person. In a good sense. I found my low moods and guilt evaporated when I stopped attending meetings and reading the literature.