At the 2012 European Championships, Tumilovich was a member of the group that won the all-around silver medal and gold in 3 ribbons/2 hoops. At the 2012 Summer Olympics in London, she won silver in the group all-around event together with group members Maryna Hancharova, Ksenia Sankovich, Nataliya Leshchyk, Aliaksandra Narkevich, and Anastasia Ivankova.