Hello! Today I went to water and feed my chickens and I noticed one of my hens sitting in a corner. I looked closer to find that her eyes were swollen shut, she has some liquid (don't know if it is puss or some discharge) on her beak, she had poo all around her back feathers (around her butt), that she had a large bump on her back, and I saw traces of blood on her left wing. I picked her up and separated her from the rest of the flock. As I did so, she could barely keep her head up. I let her be for a couple of hours and she is still alive but exactly the same. She was completely fine yesterday. Please help, I have no idea what is wrong with her and I am not sure if whatever is might be a threat to the rest of the flock. Thank you!