Fetaui Mata'afa was involved in numerous voluntary organisations in Samoa, primarily related to women. From 1960 to 1965 she was President of all Women's Health Committees in the country. She was also President of the Red Cross of Western Samoa from 1964 to 1980 and President of Girls' Brigade from 1980 to 1990. Her longest service was with the Western Samoa National Council of Women as President from 1965–1980 and general secretary from 1981 to 1989 and then as a Permanent Member of the Executive Committee.