04-16-2012, 12:58 AM
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She sounds like she could be sick, .. or.. she could be in broody mode. I have had chickens go broody (mother hen on eggs) when there were no eggs under her and she "protects" her nest anyway. Her behavior sounds just like a hen brooding eggs. They only get up once a day to eat, drink, and potty and once they are done with that and a few dirt scratches, they race back to the nest. They loose weight like this too, but the fact that she's fluffing feathers and screeching at you sounds like she's trying to defend her nest.
I second looking around for different chicken forums for more info.