One of my chickens, about 7 months old, is acting very strange. She's staying in her nest outside the pen, where she typically escapes to in order to lay. She's been there for 5 days. She hasn't laid an egg in 4 or 5 days. At first I thought she just wanted a baby. But now I'm worried. She's not eating or drinking, unless I take her out of the nest and put her back in the pen. After a few minutes she jumps back out and goes to her bush. I was thinking maybe she was eggbound, but when i put my finger up there I didn't feel anything. She's definitely hot though. I noticed she's loosing her feathers on the underside too. When you take her out of the nest and put her on the ground she just sits there...after a while she'll get up. What should I do?