Does she have a bad odor? Has she seen any respiratory disease, such as coryza in the flock in the past? I would use a warm wet compress on the eye for about 15 minutes to get it moistened and warm. Then have an assistant wrap her in a towel like a burrito to work on getting the pus out. You will need QTips, maybe tweezers or a manicure instrument, saline and a syringe to flush out the eye, and gauze or cotton pads. Flush out the eye with saline. Apply some plain antibiotic ointment into the eye. It may take a few attempts over a couple of days to get it all out. Saline can be purchased at your pharmacy, or you can make it at home. Add 2 tsp of salt to 1 quart or liter of water, bring to a boil, simmer for 15 minutes on low, and cool before placing in a clean jar.