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https://www.backyardchickens.com/threads/urgent-torn-skin-and-a-need-for-advice.1606092/ Here's a very similar thread to what you're going through. Might give you a little bit more direction...

Do what you can, see if maybe you can restrain her for a little longer to get more done, and keep applying Neosporin or some other antibacterial agent. At this rate you might be better off getting a surgical scissor/scalpel and cutting/debriding them out depending on how close the feathers are...

Best of luck to you. You might have to take a sterile needle and dig the feather out like a splinter.

Have you tried a warm cloth beforehand?

Maybe try gently pulling them off with good tweezers? If they heal into the wound or skin grows over them you're going to have problems...

I don't know that there's much you could do to keep the skin from pulling away to be honest, aside from taking her to a vet to get stitches. Keep flushing the wound site as much as you can and monitor her for any changes. There's been quite a few chickens come back from getting huge chunks of...