Following art studies in Bendigo and Melbourne, Cohn travelled to London in 1926 where she advanced her skills in bronze casting and woodcarving at the London School of Arts and Royal College of Arts. Training primarily under modernist sculptor Henry Moore, she developed an interest in the elegant, simplified forms of Egyptian, Assyrian and Greek sculpture.
Returning to Melbourne in 1931, Cohn became a driving force in Melbourne’s art world. She was President of the Melbourne Society of Women Painters and Sculptors from 1948 until her death in 1964.