Edger had several positions in the Women's Christian Temperance Union New Zealand (WCTU NZ). She served as an assistant Corresponding Secretary, White Ribbon Associate Editor (11 years), Recording Secretary (15 years), national Superintendent of Scientific Temperance Teaching, and national Superintendent for Peace and Arbitration. She was also a founding member of Wellington's Society for the Protection of Women and Children, and a Dominion Secretary of the League of Nations Union of New Zealand.[6]