One of the 2 month old chickens I put down in the main coop with the others is not looking so great today. I believe she's an Easter Egger? or maybe a mix with one... she has greenish legs. She doesn't seem to have suffered any injury but she's all puffed up and just wants to close her eyes and sit very still. She makes noises when I pick her up and will open her eyes a little but mostly just wants to keep them shut. I checked the vent all seems fine that way. I've brought her indoors and put her under a heat lamp just in case warmth will help. Any ideas of what I might do to save this chicken?