boumeester's first solo exhibition in france took place at the galerie bonaparte. her work was often exhibited in group shows alongside artists like hans hartung, kandinsky, and viera da silva. boumeester and goetz relocated to nice at the start of world war ii, where they were both active in the resistance, helping create forged papers. the couple's close association with the artist community continued, including collaboration with raoul ubac and christian dotremont. during the war boumeester also began a close friendship with the painter francis picabia; she would later restore his famous work "udnie".