After the German occupation of Paris in 1940, Jacques Rouché sought to re-open the Opéra and invited Lubin to return to sing "Alceste". This was followed by performances of "Fidelio" and "Der Rosenkavalier", and in 1941 she again sang Isolde, this time with the visiting company of the Staatsoper from Berlin under the direction of Herbert von Karajan. She continued to associate with German acquaintances, and in 1942 she performed at a concert to mark an exhibition by Arno Breker, the sculptor who was closely associated with the Nazi leadership. (She later said that she had agreed to this performance as part of a deal to secure the release of Maurice Franck, the Jewish "chef de chant", or music staff/vocal coach, at the Opéra.)