My chicken, Henretta, had a growth on her eye and because she is very timid, we could not get a close look at it. After about a month it fell of and we thought the problem was solved. When i went out to feed her one day, i saw that she had no eye left! it was completely hollow. She gets around great but sleeps more than any one of our chickens. What do you think happened to her eye? is it a disease? Will it affect the other chickens?