Born in Wuppertal, Kaiser studied singing at the Hochschule für Musik Detmold with Mechthild Böhme and Caroline Thomas.
Already during her studies she sang in university productions of Handel and Rossini operas and made a guest appearance as Lisetta in Haydn's Il mondo della luna at the Städtische Bühnen Münster.
In November 2013, she gave a guest performance with the Grazer Philharmoniker [de] conducted by Dirk Kaftan at the Wiener Musikverein, singing the song cycle Les nuits d'été by Hector Berlioz after poems by Théophile Gautier.
In February 2015, in a concert performance by the Orchestra Sinfonica di Milano Giuseppe Verdi conducted by Gaetano d'Espinosa in Milan, she took on the role of soprano.
[6] Bellini: Bizet: Donizetti: Faccio: Glinka: Handel: Humperdinck: Mozart: Scarlatti: Johann Strauss II: Wagner: