She performed with the Adelaide Repertory Theatre, before moving to Melbourne in 1914 to begin her professional career with the Julius Knight Company.

Back in New York she appeared in Lawful Larceny on Broadway, and transferred to London with the full production in 1922.

Robertson returned to Sydney in 1924[11] and appeared as Portia in The Merchant of Venice in Melbourne with Maurice Moscovich.

[12] Following a successful run in The Outsider at the Theatre Royal, Melbourne,[13] the play's producer, Moscovich, invited Robertson to perform the role in London.

[14] With Mosovich she toured New Zealand from June to August 1925 where the reviewer for the Evening Post described her in The Outsider as "one of the finest leading ladies we have seen.