Career
Born in Curban in New South Wales to farmer Daniel Diggs and Catherine Kain, she was educated at the Curban public school until the family moved to Dubbo when Catherine was fourteen. She was a domestic in a hotel before moving to Sydney around 1898. Her sons, Jim and Dan went onto become notable cartoonists.
She also joined the Australian Labor Party around this time.
On 24 November 1931 she became the first woman to serve in the New South Wales Legislative Council when she was appointed by Premier Jack Language (she was joined two days later by Ellen Webster). She served until 7 September 1932.
A Roman Catholic, Green died in 1965 and was buried at Rookwood Cemetery.
