Catherine was born in 1864 to James Cooper and his wife Eliza (nee Carty). Catherine married William Pett in Moonta on 14 May 1887. Catherine appeared on the 1891 Northern Territory Census listing her profession as teacher. In 1895 when Catherine was 31, she was one of the 82 women who enrolled to vote after the franchise was granted to South Australian and Territory women in 1894. Her occupation was listed as 'school teacher'. Catherine taught for 22 years at the Palmerston (later Darwin) Public School, commencing in 1889. She was on her own much of the time having to cope with up to 90 children. Catherine and her husband lost a son to croup when he was 5. Catherine was a much loved school mistress in Darwin, but left in 1910 to take up a ...