Ka kammala wannan magana: A ƙarshen shekara ta 2005, ta ji tana son ta koma yin wasan motsa jiki, tana mai da hankali ga horar da kanta da kuma kula da ɗanta. Rashin nasara ga Nataliya Tobias a gasar zakarun kasa ta 2006 ya karfafa mata gwiwa don sake fara sana'arta kuma ta fara horo tare da Iryna Lishchynska. Ta yi farin ciki da ingantaccen lokutan ta amma ta sha wahala daga fitowar da ta yi a wasan kusa da na karshe a gasar zakarun Turai ta 2007. Lokacin waje a 2007 ya zama abin juyawa; ta dauki lambar azurfa a gasar
2007 Kofin Zakarun Turai kuma ya kafa sabbin bayanan sirri na mita 400 da mita 800. Ta yi tseren mita 800 a karkashin minti biyu a karon farko a gasar zakarun kasa, inda ta yi nasara a cikin dakika 1.59.60. Ƙarin ci gaba ya zo ba da daɗewa ba a 2007 Summer Universiade inda ta lashe lambar zinare, ta kafa lokaci mafi kyau a duniya na 1.57.63 seconds. Matsin lamba don yin gasa a Gasar Cin Kofin Duniya ta 2007 a matsayin jagora a duniya ya tabbatar da yawa ga Krevsun, kuma an fitar da ita a cikin zafin jiki tare da ƙasa da minti 2.02.45. Koyaya, a ƙarshen kakar wasan har yanzu ita ce ta biyar mafi sauri a cikin 'yan wasan mita 800 a wannan shekarar.