Born in Damm near Aschaffenburg, Deetz, the daughter of the municipal music director Brand, received her musical education in Vienna through Matteo Salvi and Eckart (Karl Anton Eckert?)
and entered the stage for the first time in Hanover in 1856 as Agathe in Der Freischütz.
Then she didn't accept any further fixed engagement, but only appeared as a guest at excellent art places.
[1] She was the first "Elsa" in Mannheim (9 January 1859) and in Rotterdam (19 January 1859) as well as the first "Gretchen" in Amsterdam, Wiesbaden and Rotterdam, created "Elisabeth" in Tannhäuser in Amsterdam in 1865 and "Selika" in L'Africaine in Leipzig on 12 February 1866.
She was buried at the Jerusalem and New Church in front of the Hallesches Tor, where her husband would later also find his final resting place.