Career
She represented Poland at the 2000 Summer Olympics, ranking fifth in the 58 kg category, with a total of 202.5 kg. On April 11, 2002 Aleksandra Klejnowska and Dominika Misterska failed a drug test carried out in training by the World Anti-Doping Agency. Both appealed, but the IWF Executive Board decided on November 17, 2002 to suspend them for two years.
At the 2004 Summer Olympics she ranked fifth in the 58 kg category, with a total of 220 kg.
Klejnowska competed in the Women"s 58 kg at the 2005 World Championships in Doha, Qatar but finished un-ranked because she missed all of her three snatch attempts. At the 2008 Summer Olympics she ranked 7th in the 58 kg category, with a total of 215 kg.
At the 2012 Summer Olympics she ranked 7th in the 53 kg category, with a total of 196 kg.