After being refused permission to emigrate to West Germany in 1985, Müller was finally allowed to leave along with her then-husband, novelist Richard Wagner, in 1987, and they settled in West Berlin, where both still live. In the following years, she accepted lectureships at universities in Germany and abroad. Müller was elected to membership in the Deutsche Akademie für Sprache und Dichtung in 1995, and other honorary positions followed. In 1997, she withdrew from the PEN centre of Germany in protest of its merger with the former German Democratic Republic branch. In July 2008, Müller sent a critical open letter to Horia-Roman Patapievici, president of the Romanian Cultural Institute in reaction to the moral and financial support given by the institute to two former informants of the Securitate participating at the Romanian-German Summer School.