While serving in the presidency of their wards' Primary, my mother-in-law and my daughter-in-law both ran into the same problem.
They desperately needed more teachers for a crowded Primary. The presidency would submit to the bishop the names of older sisters who had no calling in the ward women who understood the gospel, who had wit and energy to spare, or so it seemed.
But the bishop would return with the message that sister after sister had declined the calling.
The reason was the same, every time: "I served my time in the Primary when I was a young mother. Now I want to attend Relief Society."