My almost 8 month old RIR pullet limps when she runs. This started yesterday, after I locked them in the coop all day. I think it's possible she MAY have injured herself inside. The galloping has happened before - once - when she was around 6 months old. The problem resolved itself later that day, bringing me immense relief. But now it's back again. She's limping when running in a sort-of-galloping manner, even worse than yesterday. She still walks normally and does everything else fine. What could this be? I'm leaning towards an injury, but really, I don't know. Her feet may or may not be swollen; I can't really tell. Should i give her half a baby aspirin in the meantime? What could this be?