After the turn of the century, she turned her eye to welfare issues. She was particularly concerned with women's health and the welfare of disadvantaged groups, such as disadvantaged children and prostitutes. She became extraordinarily active in women's organisations and welfare organisations, serving on numerous committees. The building of Perth's King Edward Memorial Hospital for Women in 1916 was largely a result of her efforts. She helped form the Women's Service Guilds in 1909 and was a co-founder of the Western Australia's National Council of Women, serving as president from 1913 to 1921 and vice-president until her death. Cowan was also a Western Australian delegate to the national assembly for 19 years.