During the First World War, she was the principal nurse of the Association des Dames de France under the Red Cross. She is remembered for her heroic service, frequently being associated with the war veterans.[3] After her activities as a pacifist, she participated in discussions of the parliamentary committee on social affairs, especially those relating to children. It was Germaine Malaterre-Sellier who drafted the committee's report.[2]
She continued to serve public institutions in the 1930, becoming the first French women to be appointed a technical adviser to the League of Nations in 1932.[3] In 1937, she conducted a survey in the United States and Canada on behalf of the League of Nations.[2]