Kammala jumla mai zuwa: Ta fara gasar cin kofin duniya a watan Disamba na 1978 yana da shekara 16 tare da kammala podium a slalom a Italiya. Gasar cin Kofin Duniya ta farko ta zo ne a lokacin da take da shekaru 18 a watan Janairun 1981, ta farko daga cikin nasara hudu a cikin babban slalom a wannan kakar nasara. McKinney ya yi tsere a gasar cin kofin duniya na tsawon yanayi goma sha ɗaya, kuma ya yi gasa a wasannin Olympics uku da kuma gasar zakarun duniya biyar. Ta lashe lambobin yabo hudu a gasar zakarun duniya; tagulla a hade (1985,
1987) da slalom (1989), da kuma lambar zinare a hade a Vail a 1989.