Mystery of the missing chunk or bread.

I made some bread today and after the girls had a few slices, I went to put it away. I notice a chunk missing from the rest of the loaf, like a really big air bubble. Gwen is sitting over on the couch where I can just see her head, she's looking right at me. So, I hold up the bread and ask "Did this have a big bubble in it or did someone here help it along?" And Gwen's eyes get wide and guilty looking and she just slides right out of sight.