Over the past week or so I have one of my Isa Browns that sits outside aftre everyone else has gone into the coop to roost...I have to pick her up and put her back in almost EVERY night lately. She doesn't act like anything is wrong any other time of the day. She is eating, so, what could cause this all of a sudden? It worries me because it has gotten COLD lately and I'm afraid she will freeze or get frostbite ! HELP PLEASE!