[1] In 1863, Deinet was appointed to the Bavarian State Opera where she remained until her retirement from the stage fifteen years later.
Her first assignments at the house were Isabella in Giacomo Meyerbeer's Robert le diable, the Queen of the Night in Wolfgang Amadeus Mozart's The Magic Flute, and Leonora in Giuseppe Verdi's Il trovatore.
On 10 June 1865 she created the role of Brangäne in Wagner's Tristan und Isolde under the baton of Hans von Bülow.
[3] While performing in Munich, Deinet met actor Ernst von Possart (1841–1921) and began a romantic relationship with him in the mid-1860s.
Among the many roles she sang at the Bavarian State Opera were Konstanze in Mozart's Die Entführung aus dem Serail, Marie in Gaetano Donizetti's La fille du régiment, Susanna in Mozart's The Marriage of Figaro, Inez in Meyerbeer's L'Africaine, and Venus in Wagner's Tannhäuser.