I live on acreage and our 4 hens are very happy and wander around all day under the protective eye of our dog. All good. Except lately one of them stays in the laying box in the coop and doesn't come out. She'll stay there all day if I don't pick her up and put her outside to be in the sun and get some food, and she doesn't eat the commercial feed in the coop either. When I put her outside she gets angry and charges around on the grass squawking. She'll stay outside for a while and then head straight back to the coop again. The other hens are fine and don't do this at all, only this one. What is wrong with her?! Is she just being overprotective of the eggs and is this normal behaviour? Thankyou!