Went out to check on my chickens the other day, and one of my three year old hens was being attacked by two other hens. Upon closer look, her puples looked like snake eyes and she's suddenly blind as a bat. I'm not sure what's wrong with her. Could she have eaten some fungus or bitten by a poisonous spider???? Please help! She is having trouble finding her food and water. I have separated her from the other chickens and am giving her antibiotics, but it doesn't seem to be working. Any ideas on how to help her????