 She sang La femme and Concepción in the first and third parts of a triple bill of "Vol de nuit", "Le Rossignol" and "L'Heure espagnole" in Brussels.In 1960 Poulenc wrote his "La Courte Paille" song cycle (poems by Maurice Carême) for Duval – or rather "for her to sing to her six-year-old son" (although she did not premiere it) – and later for her also "La Dame de Monte-Carlo", in 1961.Following incorrect administration of cortisone treatment she retired in 1965 from performance and moved to the home her husband had built in Switzerland, while retaining some teaching at the École française de musique.