Hen not roosting in coop

[Pheasant283]

I have 4 young production reds and 4 young ameraucanas, about 4 months old. Out of the 8 hens 1 production red hen says out in the pen and sleeps in a dog house I have in the pen for the ducks (that they dont use), while the other 7 roost in the coop. Also when I feed them all of the chickens and ducks come running except for that one hen, Is she anti social? Sick?

 

[Judy]

Quote:
My guess would be, she is at the bottom of the pecking order and avoiding harrassment. Is there room for a second roost? Or, if the dog house is secure from predators, you could just let her sleep where she chooses.