Kammala jumla mai zuwa: De Leeuw ya sami nasara a duniya a kakar wasa ta 1973-74. Gwarzon ta na farko a Gasar ISU ya kasance azurfa a gasar zakarun Turai ta 1974 a Zagreb, a bayan Christine Errath. A cikin
A gasar zakarun duniya ta 1974 a Munich, an ba ta lambar tagulla kuma ta hau kan podium tare da Errath da Dorothy Hamill.