In 1814, she married the biographer Karl August Varnhagen von Ense in Berlin, after having converted to Christianity—this also made her sister-in-law to the poet Rosa Maria Assing. At the time of their marriage, her husband, who had fought in the Austrian army against the French, belonged to the Prussian diplomatic corps, and their house in Vienna became a meeting place for Prussian delegates to the Congress of Vienna. In 1815, she accompanied her husband to Vienna, and then to Karlsruhe in 1816, where he became a Prussian representative. She returned to Berlin in 1819, when her husband retired from his diplomatic position.