[1] After graduating from high school, she studied piano with Pavel Gililov at the Hochschule für Musik und Tanz Köln (diploma 2005) and composition with Wolfgang Rihm at the Hochschule für Musik Karlsruhe (diploma 2008, concert exam 2011).
[2] Her works are performed at international festivals and by various performers, such as the Arditti Quartet, Quatuor Diotima, Ensemble Modern, Ensemble ascolta, Ensemble recherche, Fukio Saxophone Quartet, LUX:NM [de], Marc Bouchkov, Erik Nielsen, Christoph Eschenbach, Tabea Zimmermann, Orchester Nationale de Lorraine, Bad Reichenhaller Philharmoniker [de], Bamberg Symphony and by members of the Berliner Philharmonic.
[3] In 2014, two music theatre works, Querelle of Brest after Jean Genet and The Nightingale and the Rose after Oscar Wilde's short story of that name, were premiered at the Deutsche Oper Berlin, and at Klang 21's [de] Taschenopernfestival [Pocket Opera Festival] in Salzburg in 2017 the piece Gib mir Dein after a story by Thomas Mann.
[4] Bertelsmeier taught composition in youth seminars at the Beethoven House and the Landesmusikrat Nordrhein-Westfalen [de] [State Music Council of North Rhine-Westphalia].
From 2009 to 2011, she taught improvisation and composition at the Hochschule für Musik, Theater und Medien Hannover.