Make a paste with a little water, Dawn, and baking soda and let sit on the clump to soften it. It should then easily wip away with a cotton ball, that being the safest substance to use next to an eye to avoid scratching the cornea.
You will need to have someone hold her head steady. Chickens are notorious for jerking their heads at the last second and disaster is the result. One time I was trimming the beak on a hen and she jerked at the last second and I cut into the quick. She bled heavily and it was a disaster.
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If pasting them down with ointment doesn't work, then trim them. I wouldn't try to remove them as it can cause irritation around the eye and maybe even infection.
Are you rinsing the eye daily with saline? Putting antibiotic ointment in the eye twice a day? That should be enough.
Use Neosporin on the feathers beneath the eye as a sort of "pomade". This will help with any bacteria, and it will "glue" the tiny feathers down and away from the eye.