As I recently posted, I lost my first bird yesterday morning. However, last fall, another hen was attacked by a neighbor's dog. I searched the forum for what to do - neosporin, bacitracin, isolation - low and behold, she was back to herself in about a week and a half and still lays glorious eggs. This forum is terrific - don't give up on your bird so quickly. They are resilient and amazing creatures - and well worth the effort to save.
Good luck
Good luck