She was the first woman in Australia both to direct and write a major national radio show, this being the serial "Big Sister".

In 1945, she wrote a play called "Lost Generations", to aid in the sale of war bonds, and was given a letter of thanks from Prime Minister Ben Chifley.

When she was nineteen Foster won second prize in a competition which led to a job offer with the radio station 2UE in Sydney.

Slowly she began to develop through short pieces for their channel until 1936 when she was writing scripts for the Broadcasting Service Association with a team that became known as the Macquarie Players in 1938.

The show held top ratings of the daytime programs during its five-year run and starred Thelma Scott, and Nigel Lovell.