Hi I have a sick chicken. She is a 2 yr old barred rock. SHe has a large feathered covered internal bump above her right eye, she occasionally vomits and looks like she is trying to swallow something, she has runny yellow poop. SHe is listless and doesnt leave the coop anymore. Tonight she isnt rooseting with the others, it seems like she has been outcasted...Please help, she is my favorite!!! She looks so old and tired! Any ideas? Please help!!!!