I got a Polish chicken that is about 2 months old with weepy eyes. Well today it's friends were out and scratching around and she was standing all puffed up, she wouldn't come out of the coop in the morning. Her eye was very weepy, so weepy in fact that the eye was sealed up. She seemed to be very thirsty but wouldn't drink. We gave her about a half a dropper full of water with some colloidal silver for infection. Then she started to pump her neck up and down and shake her head violently, emitting little squawks as if she couldn't swallow and was starting to choke. She started to get lethargic all of a sudden and was like "rolling" her head. Well then I took her under a heatlamp and set her down and she starting flapping and squawking so I picked her up. Then all of a sudden she just died and was stiff almost immediately. We buried her body away from the other chickens in the front yard. Before we covered her up we let her friends see her (who are doing very well)... it didn't seem to faze them! What do you think made her die? Is it contagious and if so how do we keep the others from catching it? Help!!