It sounds like she will be fine. Just do the first aid on her neck, and she should heal okay. If you see green skin, it can be a sign of bruising. Keep an eye out for any infection.
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Update! I took her to the vet a while ago, they trimmed the loose skin and gave her a bandage. They subscribed antibiotics and painkillers. Now she’s integrated in the flock and is fully healed, except for missing feathers on her neck. She’s massive already! Bigger than one of my standard hens, and only about four months.