I had a girl looking poorly between intense molt and cold temps. I pulled her in to my enclosed shower/bath tub and she stayed the night in the darkened bathroom. Water, food, electrolytes, and straw so she didn't slip - she was living large until her comb pinked up again. She's a Barred Rock...
I only have Barred Rocks and they push each other around like crazy! I let chickens be chickens but I did scold one of the girls for being a bully. She tried to look innocent but she had a pin feather in her beak so I wasn't buying her act.