I have one chicken that will not leave the nesting box. Day and night she sits in there and I wonder if she is even eating or drinking. When I open the nesting box she fluffs up her feathers real big and acts angry if I try and touch her. Her comb is also rather droopy, but that could be normal for her. I took her out and put her on the ground today and she ate some food but within minutes she climbed back into the nesting box. No obvious scrapes or bruises. Is this normal or should I be worried?