Early engagements at Theater Aachen featured her in roles such as Concepción (L’Heure Espagnole), Anna Kennedy (Maria Stuarda), Flora Bervoix (La Traviata), and Anne Frank (Das Tagebuch der Anne Frank). Her international debut came in 2019 with Mozart’s Requiem at the Teatro Regional del Biobío in Chile. On the concert stage, her repertoire includes major works by Mozart, Haydn, Beethoven, Rossini, Brahms, and Fauré.

Operatic appearances have taken her to stages in Germany and the UK, performing roles including Mimì (La Bohème), Contessa (Le nozze di Figaro), the First Lady (Die Zauberflöte), Malwina (Der Vampyr), the News Anchor (On Behalf of a Madman), and Sharon Graham (Master Class). She made her role debut as Leonore in Fidelio at the Chamber Opera Schloss Rheinsberg under Peter Gülke and Georg Quander. In Berlin, Knauß is also active as a co-creator in the new opera cycle Fuck Marry Kill, whose second part premiered in 2023 with support from the Hauptstadtkulturfonds.

She has collaborated with ensembles including the Beethoven Orchestra Bonn, the Aachen Symphony Orchestra, Elbland Philharmonie Sachsen, the Brandenburg Symphony Orchestra, the Russian State Orchestra Kaliningrad, and the Orquesta Sinfónica de la Universidad de Concepción.
A recipient of scholarships from the City of Berlin, the Lotte Lehmann Academy, the DAAD, and the German Music Council, she has been honored as a finalist and prizewinner in competitions including the Jacques Offenbach Grand Prix, the Kammeroper Schloß Rheinsberg Competition, the Concurso Opus Lírica, and the International Vocal Competition Gabriela Beňačková.