Mezue ahịrịokwu na-esonụ: Asọmpi mba ụwa mbụ ya bụ 2004 IAAF World Junior Championships, ebe o meriri nke anọ n'asọmpi ya. Kowalska meriri ọla edo na steeplechase na 2005 European Athletics U23 Championships. N'afọ 2006, o ritere ọla nchara n'asọmpi
European Cup na 2006 European Athletics Championships o dekọtara oge kachasị mma nke 9:42.50 na ndị tozuru oke tupu ịga n'ihu na-agwụ nke itoolu na njedebe. Ọ nọchitere anya Europe na 5000 mita na 2006 IAAF World Cup na Atens mana ọ kwụsịrị n'ọnọdụ ikpeazụ. Ọ gbara ọsọ na 2006 European Cross Country Championships na agbụrụ ndị na-erubeghị afọ 23 ma ọ bụ ezie na ọ kwụsịrị nke itoolu, o duziri Poland na ọlaọcha ọla ọcha.