I have a broody hen who has a little bit of a limp. She's close to a year old and has been sitting in her nest box for the last few weeks. I make her get out a couple of times per day. Yesterday I noticed she was limping. I'm assuming all that sitting might have caused some bother to her leg or she injured herself as she got in and out of the box. She's in a foul posture and mood everytime I shoo her out. And then she walks around half crouched and well, you know how they are. The only thing I fear disease-wise is Mareks but she's too old for that, right?