[5] Mabel Harrison is counted alongside May Hezlet and Rhona Adair as a pioneer of Irish women's golf.

[9] She had "an admirable overlapping finger grip", so much that a close-up photo of her hands on the club were included and analysed in articles about women golfers.

[16][17] In October 1913 she travelled to North America, to play in the 1913 United States Women's Amateur Golf Championship in Wilmington, Delaware (she lost to Gladys Ravenscroft).

[24] Mabel Harrison married in 1916, to an Irish military doctor who served in World War I, Francis Casement.

There is an annual Mabel Harrison Scratch Cup event, named in her memory, held by the Royal Portrush Golf Club.