Kazlaus' biggest breakthrough came in Andorra in 2000, during the master classes given by Spanish soprano Montserrat Caballé. Having witnessed her performance, Caballe greeted and complimented her: "We have a diva, a wonderful voice". The encounter led to an artistic collaboration between them, glimpses of which are featured in the documentary "Caballe, Beyond Music" (Morena Films, 2003) and in "Montserrat Caballé 40 anys al Liceu" (Fundacio Gran Teatre del Liceu, 2002). She was also a main guest at the "Montserrat Caballé prasentiert Stars von Morgen" (Franco-German ARTE TV) in 2001. A series of joint concerts soon followed, culminating in a Pierre Jourdan production of "Henry VIII" by Camille Saint-Saëns, featuring Montserrat Caballé as Catherine of Aragon, Simon Estes as Henry VIII and Nomeda Kazlaus as Anne Boleyn, conductor Jose Collado at the Grand Teatre del Liceu, Barcelona.