Sorry your wife keeps losing her phone. My wife has left hers on the counter in different stores a couple of times too, but handed in or found by staff each time as well. They are too expensive to lose.

I have a case for mine that clips on my belt, and my wife bought another that is a simple rubber hanger that hooks snuggly over the phone and you wear around your neck. That may work for your wife.

Fortunately there are still honest people in the world.