Just went out to the coop and one of my 21 week barred rocks was laying askew in a corner. She didn't come running when I tossed scratch for the flock (we have 7) and didn't move when I came over (they all usually scatter). She can't stand up and it seems to be her right leg. She got out of the henhouse fine this morning. i didnt hear any commotion this morning which would suggest an injury. I've isolated her with food and water. She ate eagerly when I put it within reach. What should I do for her?