Hi, I have 6 Isa Brown chickens who are approx 2.5 years old. They have always been healthy. Two afternoons ago I noticed one was lethargic and laying around. I thought it may have been egg bound. A friend and I checked it and there doesn't seem to be an egg stuck. Today I noticed the bottom beak is longer than the top beak. I have separated her from the others and given her wet oats and also sardines. She had a bit of a peck at them. She still seems to be just sitting around. How would her beak suddenly be shorter? It doesn't appear to have any broken off but I could be wrong. Any suggestions please.