Born: October 30, 1891 in Toronto, Ontario
Died: January 25, 1973 in Richmond Hill, Ontario
- Ontario Ladies' Amateur Champion (1922-23, 1927, 1931, 1933, 1939, 1946-47, 1950)
- Ontario Senior Ladies' Amateur Champion (1965, 1969)
- Canadian Ladies' Amateur Champion (1919, 1925-26, 1933, 1935); Runner-Up (1924, 1934)
- Canadian Ladies' Close Champion (1926-27, 1929, 1931, 1933); Runner-Up (1923, 1925, 1950)
- Canadian Senior Women's Champion (1955-60, 1962, 1965)
- United States Women's Amateur Semi-Finalist (1927, 1932)
- In 1924, Miss Mackenzie founded the Ladies' Golf Club of Toronto.
- In 1905, Ada's father George was a founding member of the Mississauga Golf & Country Club.
- Named the 1933 Canadian Athlete of the Year
- President, Ladies' Golf Club of Toronto (1924, 1943-44)
- Inducted into Canada's Sports Hall of Fame in 1955
- Inducted into the Canadian Golf Hall of Fame in 1971