Twelve years after competing in her last Olympics, Tkach qualified for her second Russian team, as a 42-year-old, at the 2012 Summer Olympics in London, by placing second in the women's trap from the 2011 European Shooting Championships in Belgrade, Serbia. Tkach had finished on exactly the same score of 70 targets as Finland's Satu Mäkelä-Nummela (defending Olympic champion) and Spain's Fátima Gálvez in the qualifying rounds of the women's trap, but narrowly lost the three-person shoot-off by half the score behind winner Gálvez, for a bonus of six points.