Hi - I am a novice chicken mom.. Have (3) 1 1/2 year old RIR's. Today I noticed one cowering by the fence, shaking. She is also twisting her neck in all directions with her mouth hanging open. She is free to roam in our small suburban backyard. No poisonous plants, bait/fertilizer, etc. around. Now it's night and she's in the coop, but standing on the floor. She's been losing feathers - all the long tail feathers just fell out - not sure if that's connected. We love our girl(s).. can you help?