Constance Robertson was born on 16 October 1895 in Sydney, the eldest of six children of Alfred George Stephens and his wife Constance Ivingsbelle, née Smith, both Queensland born. Educated by her father, Constance worked from 1911 to 1916 on the Bookfellow, a literary magazine that he owned and edited. In 1917 she began work on the Sun, becoming 'Social Editress' of it and the Sunday Sun. She was one of two female journalists chosen to cover the first Pan Pacific Women's Conference in Honolulu in 1928 for Australian newspapers. At St Mary's Catholic Cathedral she married William Kinnear Robertson, journalist, on 25 July that year; her only child was born in 1931. In 1932 Robertson edited the first issue of Ink, she edited Women's Budget from 1930 to 1936 and was editor of the women's supplement of the Sydney Morning Herald from 1936.