[2] As a seamstress she gave evidence at the 1891 Royal Commission into Shops, Factories and Workshops, that highlighted the existence of many sweatshops that exploited women workers.

While William Lane chose to set up in 1892 the New Australia community in Paraguay along socialist lines which attracted many labour activists, Miller believed Lane was "opting out of the struggle" and became a foundation member of the Workers' Political Organisation, a forerunner of the Australian Labor Party in Queensland.

[1] Miller was a founding member of the Women's Equal Franchise Association, which was established in 1894 and almost immediately suffered a split.

[3] Despite the differences, Miller, Cooper and the conservative Women's Christian Temperance Union often worked together on suffrage issues.

[6] During the 1912 Brisbane General Strike for the right to organise trade unions, Miller led a contingent of women to Parliament House.

She joined the Women's Peace Army when Cecilia John and Adela Pankhurst visited Brisbane in 1915, and was elected president.

At her last public meeting in the Toowoomba Botanical Gardens she impressed on the women present the "need to play a part in the Labor movement as it meant as much to them as the men".

The flag at Brisbane Trades Hall was flown at half mast for the "mother of the Australian Labor Party".

[12][2] In 2003, Miller's life story was featured in the exhibition "A Lot on Her Hands", presented by the Australian Workers' Heritage Centre.