When your daughter is missing, it's not only major questions that you worry about, Kate says. "It's [little] things you worry about as well. Is someone brushing her teeth? Is someone rubbing her tummy if she's not feeling well? It's all those things you do as a mother," she says.

There are times when her mind wanders to the worst-case scenario, but Kate says she's learned to cope with that as well. "I think it's natural. I know people mean well when they say, 'Don't let yourself go there,' and it's not going to help," she says. "But as a mom, inevitably there are times when I do. Those are the times that I dip down."