Pedzisa mutsara unotevera: Makwikwi ake okutanga enyika yose akanga ari IAAF World Junior Championships ya2004, kwaakapedza ari wechina mumakwikwi ake. Kowalska akahwina goridhe re steeplechase pa2005 European Athletics U23 Championships. Muna 2006, akahwina menduru yebronze mu
European Cup uye pa2006 European Athletics Championships akarekodha zvakanakisa zvemunhu pa9:42.50 mumakwikwi ekusarudza asati apedza wechipfumbamwe mumutambo wekupedzisira. Akamirira Europe mumakwikwi emamita zviuru zvishanu pa2006 IAAF World Cup muAthens asi akapedza ari wekupedzisira. Akamhanya pa2006 European Cross Country Championships mumakwikwi evanhu vari pasi pemakore makumi maviri nematatu uye kunyangwe akapedza wechipfumbamwe, akatungamira Poland kumenduru yesirivheri yechikwata.