I have 7 free ranging chickens of different breeds. My little white cochin named Peep won't come out of the nest boxes. She has been free ranging all summer with the rest of the flock and now I have to get her out of the coop in the morning just to go feed. She eats a little then goes right back to the nest boxes for the rest of the day. She still lays almost everyday. Is she dying or is it that she just doesn't like Michigan weather. Is there actually truth to fair weathered birds?