GGbear, One of my 3 year old girls started limping suddenly in the spring, and I could not see anything wrong with her foot. I gave her time and it resolved on its own in a couple of weeks. Your girl may have some sort of mechanical injury. Her foot looks ok to me, so it may be up in one of the joints. I think in your shoes, I'd just keep an eye on her and make sure she eats, drinks and roosts ok.