Kwasniewska studied English language at Wroclaw University in Poland, but she received her musical education at Jazz Faculty in Belgium.
Later Kwasniewska was recommended to the Belgian producer and songwriter Pedro DeBruyckere, who invited her to sing lead vocals on his album The Rosebud Orchestra.
Island Girl was warmly received by critics and music journalists, and was ranked alongside the earlier achievements of Anna Maria Jopek and Aga Zaryan.
During this time, they performed at many well-known venues in London, including Ronnie Scott's Jazz Club, Barbican Centre, and the Royal National Theatre.
In May 2011, Aleksandra & The Belgian Sweets played new material from the upcoming album in Belgium and Holland, where they had the chance to perform at the Music Village in Brussels to the enthusiastic response of the international audience.