After finishing this study successfully in 2001, she continued with a one-year program of musical theatre at the Fontys University of Applied Sciences in Tilburg.
During her study, the soprano performed in leading roles in operas, operettas and musicals.
For example, she played Bastienne in Mozart's opera Bastien und Bastienne.
In 1998 she won the first prize at the television contest Una Voce Particolare.After her studies, Kitzen continued performing and played in numerous productions including her role as leading character Christine in Andrew Lloyd Webber's The Phantom of the Opera and, more recently, during the 2010 Monschau Klassik festival as Zerlina in Mozart's Don Giovanni.