To be honest, I'm not entirely sure. I would have to let someone who has actually had a chicken with a dislocated leg answer, since I don't have any experience with this kind of situation.
If it is dislocated, it would have to be put back in place in order for her to heal properly. I would...
Could it be dislocated? If the hip socket feels off on one side, that might be the case. It could be a break as well, but my first thought would be dislocation.