Sidorova was a figure skater until age 13, when a leg injury forced her to give up the sport. At that point, she took up curling.[2]
As a junior, Sidorova represented Russia at four World Junior Curling Championships (2009, 2010, 2011 & 2012). She won the bronze medal as the skip of the Russian junior team in 2011 and 2012.
At the age of 19, Sidorova was named late to the Russian Olympic Team for the 2010 Winter Olympics in Vancouver, Canada as the team's third. Originally Olga Jarkova was named to the team; however, Jarkova was taken out at the last minute and Sidorova was added to the team. For the fifth match, against the USA, and the sixth match, against Switzerland, Sidorova replaced Ludmila Privivkova as skip. She also replaced Ludmila Privivkova in the 8th Game against China as the Skip. Sidorova thus became the youngest skip at the games, since British skip Eve Muirhead, while also 19 years old at the time, is ten months older.