Help!!!! I have been treating one of my chickens for sour crop. I've been out over and over checking on her. I went out a little while ago and it appears she's not using one of her feet!!! It's almost like it's frozen. It's hard and not moving, she was lifting it and stumbling a little with just the use of one foot!!! Our temps here are very cold today, like 15-18 degrees! Could it actually be frozen? What should I do?! Help!!!!