It is an infection of some sort,is it under both eyes? Does it feel hot to the touch? Not sure if you know that pus from an infection in chickens is a hard mass,not liquid like in other animals. Possible bug bites/scratch/peck or an allergic reaction to something environmental. If you see no improvement,you might want to give her some antibiotics to help clear this up. Definitely keep cleaning,apply an antibiotic ointment(nothing ending in "caine/cane toxic to chickens).
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