Anita Lasker was born on 17 July 1925 in Breslau, the youngest of three daughters in an assimilated Jewish family. All of the children learned to play a musical instrument. Anita learned the cello and attended a private school in Breslau. In 1939, her eldest sister emigrated to Great Britain.
In April 1942, her parents were deported and murdered in the Izbica ghetto near Lublin. Together with her sister Renate, Anita Lasker tried to escape to unoccupied southern France in September 1942, but she was arrested, separated from her sister and imprisoned in the Breslau prison. In December 1943 she was deported to Auschwitz, where she became a member of the “Girls’ Orchestra”. She was reunited with her sister there. The SS sent both of them to the Bergen-Belsen concentration camp in November 1944, where they were liberated on 15 April 1945. During the Belsen Trial in the autumn of 1945 in Lüneburg, Anita Lasker was a witness for the prosecution.