I would try to clean off the blood from her beak and insure that it has stopped. The blood red color will invite pecking, so you may want to isolate her with food and water for a day. Mushy chicken feed mixed with water may be easier to eat. Beaks can be injured on metal fencing especially is she is running into it after being chased. Here are a couple of articles about injured beaks that may help: http://www.poultrydvm.com/condition/beak-injuries