Maria Riva, the mistreated daughter of Marlene Dietrich, whose memoir revealed a childhood spent as her mother’s ‘handmaiden’ and personal assistant, has died aged 100.“At age three I knew quite definitely that I didn’t have a mother; I belonged to a queen,” she wrote in a searing biography published one year after Dietrich’s death in 1992 that portrayed her mother as “a heartless, manipulative, domineering narcissist who had demanded to be worship