Her broad repertory includes works from Cavalieri's Spiel von Seele und Körper to the premiere of Der goldene Drache by Péter Eötvös.
After her bachelor exam, she continued her studies on a scholarship by the Deutscher Akademischer Austauschdienst at the Hochschule für Musik Nürnberg with Edith Wiens.
When Wiens moved to New York City, Kasper completed her studies at the Musikhochschule Frankfurt with Hedwig Fassbender, graduating in 2014 with a master's degree and the concert exam.
[3] In 2014, she appeared in the leading roles (Young woman / The little Chinese) in the premiere of Der goldene Drache by Péter Eötvös, with the composer conducting the Ensemble Modern.
[1] In 2018, she recorded the soprano part in Bach's St John Passion live with Raphaël Pichon conducting the Ensemble Pygmalion, Julian Prégardien as the Evangelist and Tomáš Král as the vox Christi.