Number 28 on this picture of the Joodsche HBS of 1937. Betty de Haan did not survive. She died on 12-2-1943 in Auschwitz. Her mother was a daughter of Chief Rabbi Onderwijzer. The father of Betty was a brother of Jacob Israel de Haan. See link below and also for more in Google.
http://en.wikipedia.org/wiki/Jacob_Isra%C3%ABl_de_Haan
Addition