Born in
Trier, Kaesmacher studied with
Charlotte Lehmann and
Ingeborg Hallstein at the
Hochschule für Musik Würzburg and completed her studies in 2000 with the opera and concert exam. Since 2006, she has been taught by Monika Bürgener. Kaesmacher made her debut at the
Mainfranken Theater Würzburg in the 1997/98 season and remained a member of the ensemble until 2008. She appeared there in Wagner's
Die Feen. She then began to work freelance. She has appeared as a guest at the
Staatstheater Wiesbaden,
Staatstheater Braunschweig,
Staatstheater Kassel,
Meiningen Court Theatre,
Bielefeld Opera,
Theater Heildelberg and
Theater Chemnitz, among others. She performed the double role of Giullia/Carolina Fabbri in
Manfred Trojahn's opera
Limonen aus Sizilien. In the field of contemporary music, Kaesmacher has worked with conductors such as
Jun Märkl and
Matthias Pintscher and the orchestras including the
MDR Leipzig Radio Symphony Orchestra. She appeared at the Musica Viva festival in Strasbourg in 2007 in Unsuk Chin's
Die Troerinnen and
Kalà, with
Juanita Lascarro,
Ruth Sandhoff, , the
WDR Rundfunkchor Köln and the
Southwest German Radio Symphony Orchestra conducted by
Rupert Huber, in 2007. She has performed several world premieres of
Manfred Trojahn's works, such as the
lettera amorosa in 2007 on the occasion of the reopening of the Anna Amalia Library in Weimar,
Che fie di me for two sopranos and orchestra, together with soprano
Mojca Erdmann and the Southwest German Radio Symphony Orchestra, and in 2009
Ariosi for soprano,
basset horn and orchestra, with
Sabine Meyer and the conducted by Trojahn. In 2015 she sang
Four Last Songs by Richard Strauss in
Bad Nauheim. In addition to singing, she studied philosophy and Catholic theology at the
Justus Liebig University Giessen from 2010 to 2011 and passed the second
Staatsexamen for teaching music and ethics in May 2014. Kaesmacher achieved a teaching qualification for the subject
performing arts in 2015 and has worked at the Freiherr-vom-Stein-Schule in Wetzlar. Kaesmacher is married to the German tenor ; they have two sons.