I has a young pullet with the same thing. I was able to nurse her back to being able to walk. Give your chick some electrolights to help give her energy and keep her hydrated. You can bring her to the vet for a pretty low cost and they could but it back in socket or you can leave it that way and let it heal like that (which I did) if you diside to leave it like that keep her in a small warm cage indoors away from the others and you can wrap her leg in some gauze bandage. I'd say you should change the bandage daily.