I have a four month old Road Island red that is limping on her right foot. Upon inspection her foot is soft with no marks whatsoever. She has been keeping to herself a lot and holds her foot up when standing still. She looks well nourished and isn't being bullied by the other chickens. She has free range of my backyard and is only in the coop at night. I gave her 1/2 a baby aspirin tonight thinking it is a musculoskeletal injury. Any ideas on what could be wrong? She is young and has not started laying yet. I've wondered about her being egg bound but I am a new chicken owner and have never experienced this before.