McLean became a strong advocate of the
temperance and
women's suffrage movements. In 1891 she was the first to sign – out of an eventual total of 30,000 signatures collected in a door-to-door campaign – the
Victorian Women's Suffrage Petition for the Franchise, which was presented to parliament that year. She was a founding member and coordinator of the Melbourne branch of the
Woman's Christian Temperance Union of Victoria (WCTU); she was president of the organisation for two periods, 1892–93 and 1899–1907. Weekly meetings were held at "Torloisk", the name of her home in East Melbourne. Through the WCTU she became involved in the movement towards
women's suffrage in Victoria and published two widely circulated pamphlets about the issue,
Womanhood Suffrage and
More About Womanhood Suffrage. She was responsible for leading a delegation to Victoria's Chief Commissioner of Police in 1897 to encourage the employment of female police officers and the designation of female-specific lockup facilities. In 1902, she helped in establishing the
National Council of Women of Victoria, which advocated for juvenile courts and police matrons, in addition to women's suffrage. She was also involved in her local
Collins Street Baptist Church, where she taught Bible classes for young women. ==Later years==