maybe there is a nest in the wall behind the fridge and she can hear them? no idea what to do about it except get rid of the mice. can you block off behind the fridge and leave traps out there full time? we had a mouse problem last year that drove me completely insane. didn't bother the dogs at all.
we had no luck with traps until we got these
Amazon.com : Ortho 0321110 Home Defense Max Press... we baited them with jiff whipped chocolate pb and normal pb caught one after another almost all of them with the chocolate traps. I had baited the previous traps with the same things. I think maybe the smell wasn't strong enough to tempt them into the no kill kind we started with, and the other snap traps they were just not triggering them.
The traps that worked have the trigger surrounding the bait spot that lifted just a tiny bit above the bait when set so they can't reach it without setting it off. the down sides to the traps are a couple mice weren't as dead as the should have been, sometimes there is mouse blood around them, if you don't find the mouse fairly quickly they stick to the traps, and being plastic the catches eventually break.