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French 16-year-old Julia Pereira De Sousa was a surprise silver medal winner after struggling to qualify for the final. Defending champion Eva Samkova from the Czech Republic collected the bronze.
Moioli's bid to win the crown in Sochi four years ago ended with a sixth place after she tore the anterior cruciate ligament in her left knee.
"Don't wake me up if it's a dream," said the 22-year-old after her South Korean triumph.