I am brand new to the arena of chickens! I have recently bought a variety of chickens and they have been doing great. Yesterday one of my broiler hens stopped moving around and just laid in the yard. I tried to shoo her to get her to move and nothing. Today its the same, she seems alert, but refuses to move. I moved her over to the feeder and she eating. The other chickens are fine. Not sure what's up? She is about 8 weeks old and as a broiler is pretty big. I'm in Wyoming at high altitude and we don't really have issues with bugs. They were on medicated feed until about a week ago. Any ideas or suggestions?