Due to Swiss neutrality, Lesh grew up unscathed by the effects of World War II, and the havoc wreaked on her mother's native Austria after its annexation by the Third Reich. After the War, however, Lesch's life changed radically with the breakdown of her parents marriage. Her mother took Lesch from her father and her native Switzerland, when she was only twelve years old, to live first in West Germany in 1947, and then, because of her mother's political convictions, to the newly formed (1949) communist East Germany in 1951, when Lesch was just sixteen.