Air sac ruptures from injuries can be serious if they cause shortness of breath or severe respiratory distress. They can be punctured with a sewing needle or an 18 gauge needle if that happens, and the air squeezed out. But since this has been going on for a while now, it might be best to not deflate it, but watch it and hopefully the air will be absorbed slowly. I would keep her calm, in a dark area, and offer water with electrolytes and vitamins, and when she is is alert and more active, offer her some wet chicken feed and water. Hopefully, she will respind, but if there are internal injuroes, they may cause her to get worse. Sometimes it takes a couple of days to see if they can survive, but keeping them warm, and watered, they can pull through.