I could be way off, but in people, silvery tissue like you describe is usually tendon or ligament. DEFINITELY calls for a vet visit. In the meantime, keep the wound clean and dry, and if possible move her into a cage with paper towel substrate. I don't know that I would mess with humidity, as long as it's already correct. If you change substrate at the first sign of anything unsanitary, you should be good as far as bacteria go.

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