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Hi. My name is***** I'm sorry to hear about this situation with Ruby. That can be very frustrating when predators sneak into the enclosure to go after these little ones. Trying to predator proof an enclosure is a challenge. Just when you think it is completely safe, they can find an unexpected way to gain access. Hopefully no more entrances into it will happen after you adjust the security to the enclosure. As far as helping Ruby with her leg, the best thing you can do there is to help her to heal herself with good nutrition, rest, and hydration. Maybe separating her from any other young chickens for a few days to totally let her rest and not be overly stimulated to move / interact. That is good that there are no gross deformities visible. Hopefully this is a soft tissue injury that good nursing care can take care of.