I let the girls out of their pen, and one has an injured foot or leg. I think it's broken, but haven't picked her up and examined it yet. She can walk on it, but it's painful (even watching). I checked the pen and there's no evidence of predators getting in, so I think she just snagged her foot on something. My questions are: will this heal on its own? If not, I can't see paying an expensive vet bill for a chicken. If she does just need time to heal, will the other 3 hens pick on her? Should I separate her from the group? Any advice will be appreciated.