Born on July 30, 1942, in Haarlem, The Netherlands, Louise spent the years 1943 to1945 hiding in Amsterdam with her father, mother, and brother. Her father was a businessman, and her mother was an artist. In 1943, the family went into hiding in the storage attic of a row house in Amsterdam. They remained indoors for two and a half years, except for her father, who ventured out occasionally.