De Leeuw won gold at the 1974 European Championships in Geneva. At the 1976 Winter Olympics in Innsbruck, she carried the Dutch flag and made daily trips to Germany for ice time. She received the silver medal, while Hamill and Errath obtained gold and bronze respectively. After taking bronze at the 1976 World Championships in Gothenburg, de Leeuw retired from ISU competition. She toured with Holiday on Ice and the Ice Follies and then became a coach, working at the Westminster Ice Palace in Westminster, California and Anaheim Ice.