The belle of the ball

TKOG volunteered for a program that helps match donated prom dresses with poor high-school students at Simmons:

... In our absence, the girl had found The Dress, where it had hung neglected on a rack. Pastel blue, heavy with sequins, the kind of frothy concoction a girl only gets to wear once or twice in her life. We gushed that she looked exquisite and asked her to twirl. While she turned, her face stayed forward, eyes locked on the image in the mirror until the last possible second, when she whipped her head back around like a prima ballerina. ...