After her role in Metropolis 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 Idealer Gatte, Ein (An Ideal Spouse) in 1935.
Josef Von Sternberg's original choice for the starring role of The Blue Angel which went to Marlene Dietrich. By the time she died in 1996, she had been long forgotten, unlike her jazz-age rival Marlene Dietrich. Supposedly director James Whale's first choice for his Bride of Frankenstein. She refused to come to America. 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.