You're thinking of the disguise she used in Angband, the skin of a giant bat named Thuringwethil. She was able to use the wings to fly around the room. This is in The Silmarillion, in the chapter on Beren and Luthien (exactly where you'd expect it to be).
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"I hate dignity," cried Scraps, kicking a pebble high in the air and then trying to catch it as it fell. "Half the fools and all the wise folks are dignified, and I'm neither the one nor the other." --L. Frank Baum
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