ASTON, Pa. — The day she covered every mirror in her new apartment because she could not stand the sight of herself anymore was a red flag. But no one was around to register it. And Gracie Gold, a figure skater once on the cusp of Olympic stardom, was in no shape to help herself. Holed up in a Detroit suburb, she kept her lights off so often, she said, that the electric bill one month was less than $20. She slept as much as 24 hours at a time, then stayed awake for three nights straight. A good day was when she managed to brush her teeth and her hair. Her dream of an Olympic gold medal? That had evaporated long ago, during her slow boil of a meltdown that she was struggling to keep a lid on. In 2014, Gold was a charismatic teenage prodigy, hailed as an athletic Grace Kelly because of her tight blond bun, bright red lipstick and regal bearing, her personality so sparkling it sometimes blinded people to the fact that she had not won an individual Olympic medal. Three years later, in the dark of a Michigan winter, Gold felt her world closing…