A stray chicken adopted us about 6 months ago. After hanging around our place for about a month, she started laying an egg daily on my husband's work bench. We didn't know a thing about chickens but went online and started learning. We bought her some feed and gave her some straw and she made a nest. For several months she was very active, free ranging all over our 5 acres, returning once a day to her nest to lay. About 2 weeks ago, she stopped laying and stays on her nest 24/7 except once a day for only about 15 minutes she gets off, eats like she's starving, drinks water, and then returns to her nest. She has no other obvious symptoms of illness, except that her feces are green. Is she sick?