Hi, I’m new to chickens and appreciate any advice. My hen is lethargic past few days. Sitting, slow walking, eyes closed, droopy head at times. Her nostrils are whitish, not black as they used to be. I separated her. She drank & ate a bit. Walked some & is sleeping again now. She had poo stuck on her, now removed. Vent looks normal. Can you offer advice to help my girl Flash? Thank-you!