Every morning we check the coop for eggs. Normally all hens are roaming the yard and couldn't care less what we're doing. However, this morning one hen refused to get out of her nest. She bit me when I got close to her. I finally lifted her and found her sitting on one egg. I had taken five from her before and marked them to return them to her later. I put one under her, she cracked it and attempted to eat it. I pulled it away before she could. Is this normal? What do I do with her?