She was born in the second largest city in southern Brazil, Porto Alegre, a port town on Guaíba River.

While at university she began taking singing lessons and very quickly developed her outstanding voice.

While attending the academy, she came to the attention of André Rieu who hired her as a vocalist with his Johann Strauss Orchestra.

In addition to global touring with the orchestra, Maffioletti has performed as a soloist on several of Rieu's albums and has appeared in his PBS television broadcasts in the United States.

On Rieu's DVD I Lost My Heart in Heidelberg (2009) she sings "Die Juliska aus Budapest" and (with Mirusia Louwerse and the Berlin Comedian Harmonists) "Adieu, mein kleiner Gardeoffizier".