 Her younger sister, Charlotte, also competed as an elite gymnast, including at the 2009 World Artistic Gymnastics Championships.Coached by Vladimir and Svetlana Lashin at Omega Gymnastics, Mackie came to prominence on the Canadian gymnastics scene by winning the senior national championship at age 14.As a junior elite gymnast, Mackie was the national champion on vault in 2001, and on vault, floor, and in the all-around in 2002.