I have four hens and a rooster. Normally, they put themselves "to bed" every night at dusk. Tonight, however, one of the hens was missing when I went to shut the coop door. I found her under a bush next to the house. This is where three of the four hens always lay their eggs. One of the others lays in the coop. There was no egg from my little red hen today, and she wasn't setting on one. What's up, do you think? I'm really, really new to this.