Lily was a vision in lilac tulle, a dress we had spent three agonizing hours choosing at the mall two months ago. Her hair was woven into a complex crown braid, adorned with small, glittering butterflies that caught the strobe lights. But unlike the other girls—who were currently being spun in the air, their laughter ringing like bells, their feet resting on the tops of their fathers’ dress shoes—Lily stood alone.