hi. we got a couple new hens in our laying flock. all seemed to b doing good. today my daughter brought one in. her gizzard area was large n hard. some blood spots like maybe in a fight w another hen? her gizzard area is also lost most of its feathers. we put in her own coop on backporch. can their gizzards freeze when full of food or water? temp is looow here. 15 high wind chill 0 . any ideas? what is something warm i can feed them to help keep em warm? thank you. angela