I have a pullet that’s not putting weight on one leg. I checked and I don’t see any wounds and it doesn’t look like anything is wrong, but for 2 days she won’t get up and walk around unless absolutely necessary and stumbles when she puts weight on one of her legs. She is still eating and drinking and I haven’t seen anyone else picking on her. But she just limps around when she has to walk and then stays sitting down the rest of the day. I have no idea what’s wrong?