One of my Bard Rock chickens has a very red and crusty eye. She seams to be able to see out of it but it looks painful. Yesterday I noticed little bubbles in the corner of her eye. Today the whole eye is red and crusted over. I wiped her eye with a damp cloth but it just keeps getting crusted over again. It reminds me of pink eye in humans. Any idea of what it might be or how I can help her?