She won the Welsh Ladies' Amateur Championship four times in a row from 1906 to 1909 and again in 1912.

Duncan won the Welsh Ladies' Amateur Championship five times, in 1906, 1907, 1908, 1909 and 1912, having been the runner-up in the augural event in 1905.

Duncan won all her three matches, including another win over Maud Titterton, competing as Mrs.

[17] Sir John Duncan was ill at the time and died the following year.

Their sons Tony and George were also noted amateur golfers.