I found one of my hens with the side of her head swollen. The eye was even swollen partially shut. The swelling is very firm. I checked in her mouth and found a deep canker-like sore on the inside of the back of her bottom beak. I don't know how to treat it. She seems to have a fever. I swabbed out the canker with saline solution and wiped out both puss-like stuff and solid bloody material. She is not eating, so I fear she will go down quickly. Any hints how to treat her both for the canker sore (or whatever it is) and the fever? I really like this hen and would hate to lose her. any help would be appreciated!!