After her role in Metropolis (1927) she made a string of movies in which she
almost always had the starring role, easily making the transition to
sound films. Her last film was An Ideal Spouse (1935) (An Ideal Spouse) in
Due to the coming of sound films and her disgust with Adolf Hitler's
takeover of the German film industry, she retired to Switzerland in
1935 and never made another film. She lived out the rest of her life in
quiet solitude, repeatedly refusing to talk about her film career
anywhere at any time.