Boslak's personal outdoor best is 4.70 metres, achieved at the 2006 European Cup in Málaga on 28 June 2006 and in the pole vault final of the 2007 World Championships in Osaka on 28 August 2007. She achieved her personal indoor best of 4.70m in winning the silver medal on 11 March 2012 at the 2012 World Indoor Championships in Istanbul.