In 2006 participated with Her song "Na kolana" ("On your Knees") in the Piosenka dla Europy 2006 to the Eurovision Song Contest 2006 in which she ended 1st in a draw with Ich Troje but according to rules the group was send to represent Poland due to higher televoting score and they ended 11th in the semifinal, but for Kasia, her song became a hit of the year in Poland and some other parts of Europe.
Piosenka dla Europy was held at the TVP studios in Warsaw, hosted by Artur Orzech.