[3] While enrolled at the University of British Columbia (UBC), Leeming was told she would fail her classes if she took some time off to meet another tennis player for an exhibition match in Vancouver since sport was not considered as legitimate activity for women in that era.

[5] Aged 12,[6] she won the annual challenge Pooley Cup to become the girls' junior tennis champion of British Columbia in 1915.

[2] In 1923, she progressed to the final of the women's singles division of the Oregon State Tennis Championship, and won the title with a victory over C. J. Cushing that July.

[15][16] Leeming was selected by the British Columbia Lawn Tennis Association to compete at the 1928 Dominion Championships staged in Toronto.

[18] Leeming subsequently lost to Dorothy Weisel in straight sets of the women's final of the Oregon State Championship in July that year.

[26] She retired soon after on advice to cease playing tennis due to a hip injury she picked up in competition.

[5][27] Leeming did three years of teacher training at UBC following her 1926 graduation, and taught in Duncan before moving on to teach English at History at King Edward High School in Vancouver.

[4][5] After a period in England,[28] she spent a year as an exchange teacher at Mansfield Boys' School, in Durban, Natal, South Africa, where she was the only Canadian amongst the staff there before returning to Canada in early 1940.

[3][28] In 1942, Leeming's two-hour film of the views and the flora and fauna of South Africa was shown at an illustrated lecture of hers held in aid of Vancouver Island's Queen Alexandra Solarium.

[29][30] She joined the faculty of UBC to instruct female students to play the individual sports of badminton, golf and tennis in 1947.

[2][6] Leeming was the first female tennis player to be elected to the BC Sports Hall of Fame as an individual in 1978.

[32] She was named as one of the Top 100 Island Athletes of the 20th Century by the sports department of the Times Colonist newspaper in December 1999.