She gained ensemble experience in the Kammerchor Stuttgart under the direction of Frieder Bernius. Radio recordings at radio4 and SWR document their work. Since the 2015/2016 season, Kathelijne has been engaged at the Theater für Niedersachsen in Hildesheim, where she sang roles such as Esmeralda in Smetana’s “The Bartered Bride”, Arsena in Strauss’ “Zigeunerbaron”, Cephisa in Telemann’s “Orpheus” and Rapunzel in the musical “Into the Woods” by Stephen Sondheim. She is also currently engaged at the Opernmobil Hannover, where she performed the role of Stella in Paul Lincke’s operetta “Frau Luna” and most recently the role of Anastasia in “Die Csárdásfürstin” by Emmerich Kálmán.
Recently she sang the role of “Ildegarde” in Francesco Gasparini’s new opera “Hamlet” or “Ambleto” at the Theater für Niedersachsen.