I have a hen that is acting lame in one leg, kicking it out behind her when she walks, drooping her wing towards it, resting on the toes of that foot, and all around acting very lethargic... But only at night! During the day she's eating drinking walking around just fine. Its been going on for the past two nights, and is worse this night than it was last. Her balance was off, so. I had to put her in the nest box to sleep. Any help would be greatly appreciated!