She was born into the large family of
Stephen O'Mara who was the Mayor of Limerick and an Irish nationalist. Her family were nationalists and her father had resigned as a Member of Parliament in 1907 in order to support
Sinn Féin. Using her family's money they started the
Film Company of Ireland which created dozens of silent films. they and Henry M. Fitzgibbon. During the
Easter Rising in 1916, the FCOI's
Sackville Street offices in Dublin were destroyed and the company moved to 34 Dame Street. By 1917 she had written a screenplay and the company was filming an ambitious film based on the book
Knocknagow by
Charles Kickham. The film supported her family's nationalist aspirations. However they made many more and their film company is said to be the "most prolific indigenous film company" throughout the whole of the silent film era. In 1919 her son caught
typhoid fever and Sullivan caught the disease and died. The film company ended the following year once the three films in production had been completed. == References ==