(6 is supposedly the minimum for neons)
That being said, unless you see the others picking on this one, I would doubt it's aggression. It takes a lot of picking to make the kind of marks your describing. Again, that being said, I have seen other fish show these kind of signs with sore that get ammonia burn or infection.
I would personally keep her seperated in a hospital 'tank' and dose with Melafix and water changes until she's better.
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