My Americana (named Marshmallow) who's almost 12 months old went to bed in her nest where she lays her eggs!! Yesterday afternoon I noticed her laying in the nest, so I could not collect the eggs. This afternoon she ate some shell that she may have broke and brought it out of her nest and she & the other chickens ate some of it too. My concern is this, I called a friend I checked her Vent underneath it and its empty I don't feel any egg that is waiting to hatch. Why is she laying in there at night time? Please help me, her Vent doesn't seem to be dirty at this time. But I will take a flashlight and get a closer look.