Career
Sidko has nineteen wins at various levels in distances in up to 10 km since 2002. She took the 2007-2008 season to pregnancy, but returned for the 2008-2009 season. Sidko was blacklisted from competing at the 2010 Vancouver Olympics for breaking anti-doping rules.
She had tested positive for EPO at a race in Krasnogorsk 26 December 2009 and was subsequently banned from sport for two years.