Eftimova represented Bulgaria at the 2008 Summer Olympics in Beijing. She competed at the 100 metres sprint and placed 4th in her heat without advancing to the second round. She ran the distance in a time of 11.67 seconds.
In May 2012, the Bulgarian athletics federation announced a two-year ban for Eftimova after testing positive for somatotropin at the World Championships held in August 2011 in Daegu, South Korea. As a consequence of the ban she missed the 2012 London Olympics.
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