“SUMMERVILLE — For her toenails, after careful thought, she chooses a shimmery purple OPI lacquer called Suzi & The 7 Dusseldorfs. Her mother opts for a pearly blood-red. The salon, bathed in fluorescent lights, reeks of acrylic and acetone. Her father, beads of sweat pooling on his forehead, hunkers down in a chair by the door.”