I had a young chick about 4-6 weeks old attacked by a hawk last fall.  I saw the hawk in the run and ran to it as it flew off without a chick.  I was counting the chicks and was missing one, as I saw it lying there looking like it was dead. I picked her up, she was alive.  I checked for injuries, she had nothing visible to me.  I figured the hawk chased her and she collapsed out of fear. I put her down and she walked a few feet and then just stopped and stood there. I assumed she was traumatized. For the next five days she wouldn’t eat or drink. I went and bought her a vitamin supplement that had a dropper. I begin feeding her several times a day with water and vitamins. She only stood still.  No participation in any chick activity with the others. Finally on the fifth day she began to eat very little, the next day preening. She survived but I think she may have had some head trauma or eardrum.  She has some slight issues, I don’t want to bore you with more details.  She is a great egg layer