She made her World Cup debut in December 1978 at age 16 with a podium finish in a slalom in Italy. Her first World Cup victory came at age 18 in January 1981, the first of four wins in giant slalom that breakthrough season. McKinney raced on the World Cup circuit for eleven seasons, and competed in three Olympics and five world championships. She won four medals in the world championships; bronze medals in the combined (1985, 1987) and slalom (1989), and a gold medal in the combined at Vail in 1989.