My poor chicken has a swollen eye, and I have no clue what happen.Her other eye is fine. She is in a area with a full grown rooster and a little bantam hen that is not aggresive at all. I gently washed it with warm water and it hurt her. I have no idea what it could be . She has no puncture wounds or bite marks. We have a good size chicken family and this is the first I have seen anything like this. Here is a couple pics. someone please help.