blood in nesting box

Hi there all, I am having quite the triage day on this rainy Halloween! I went out earlier and my white Cochin had a broken feather on her foot. I took her in, cleaned it with water and put cornstarch on it. It seems to have stopped the bleeding. I had not checked best boxes because I was busy...

Help please! When we came home from work tonight to lock the girls up in the coop and collect eggs, we found blood on the walls of all four nesting boxes, some of the eggs, and a few spots on their front porch and side of coop. There was a new blue egg with blood on it as well. We were not...