Use anything you are comfortable with. You can even file it down. Cat clippers should do it, though.
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It's in her favor, and yours, that she's made it this far. Severe FTT chicks usually die in the first two weeks.
I've successfully nurtured a FTT chick to adulthood feeding tofu as a treat each day for all of the chicks. I never removed a chick from her mates except when hopelessly sick. Even a severely injured chick was left with her mates while recovering. They do so much better with the others, and when I fed the tofu with Nutri-drench sprinkled over it, all of the chicks got some. This tactic actually stimulates the weak chick to eat whereas if left alone, they have a much poorer appetite.
That FTT chick never did achieve full size, and I had to rehome it since I raised it for someone else. The little male did fine except it was so small it got out of the run and was picked off by a predator.