My beautiful 3 mth BCM boss hen is gasping for air! I brought her inside and put her in an isolation cage, gave water with vitamins and electrolytes, as well as feed. In the coop, her only symptoms were half closed eyes and an occasional gasp for air (pump handle) She was moving about normally and leading her flock as usual. Inside, in isolation, she is tired and listless, eyes half closed, gasps for air maybe every 5th breath. Poop looks normal (green and white firm poops, brownish cecal poops) Drinking quite a bit - I mixed her a electrolyte, plus vit/min warm water eating somewhat, but not the usual moving about, pecking, eating, chatting on the thin side, but was worse when I got her 2 months ago no nasal discharge no eye goop/discharge/bubbles, etc. no sneezing no bad smell no lesions on the body that I can see, but she has black, feathered legs... her little comb appears to be normal, but is grey-black, so hard to tell if it is pale or not... no other problems with her body or legs She lives in a very well ventilated coop with 7 other youngsters her age (3mths) pine shavings for bedding, roosts, nest boxes All the others seem fine They are fed pellets free choice, yogurt, treats, watered with chicken nipples, so clean, fresh water each day It has been bitter, damp, and cold here, they've been sitting under the light at night She is fully feathered Any ideas would be VERY welcomed...scaring myself trying to research!! Help!