She worked in German films until the start of sound movies. Nielsen made only one feature movie with sound, "Unmögliche Liebe" ("Crown of Thorns") in 1932. However, the new technical developments in cinema were not suitable to Nielsen's style, nor could her maturity compete with the young American ingenues, so she retired from the screen. Thereafter, Nielsen acted only on stage. After the rise of Nazism she was offered her own studio by propaganda minister Joseph Goebbels. Nielsen later described being invited to tea with Adolf Hitler, who tried to convince her to return to film and explained the political power of her on-screen presence. Understanding the implications, Nielsen declined and left Germany in 1936. She returned home to Denmark where she wrote articles on art and politics and a two-volume autobiography.