My Rhode Island Red hen, Baby, hasn't been feeling well the last few days. She has a pale comb, is weak and lays down a lot, decreased egg production, her comb always sticks up but is now flopped over, and has green diarrhea. Yesterday I took her inside and put her in a dog kennel with plenty of food and water for a few hours to rest. In the evening I put her back in the coop. Today she didn't look as bad but still weak so I took her in and she will stay over night. Over the winter she got sick a few times and we had to take a syringe to feed her otherwise she would've died from starvation and dehydration. Therefore she doesn't have the strongest immune system. We checked her feces for worms but she didn't have any. What disease does she have? How can I help her?