I need help, I was on the outside of my chicken pen when one of my hens ran down the run, and knocked another hen to the ground, she then pecked her head over and over. She brought blood. The injured hen is still alive, I have her separated, and I gave her some egg, oats, and honey to give her a boost. I still don't know if she'll make it. What caused this to happen? The hen that got hurt wasn't bleeding or anything like that. I have the attacking hen separated too, what should I do with her?