In 2009, Staniouta debuted as a senior and won two medals at the 2009 World Championships in Mie. She won bronze in the rope event at the Rhythmic Gymnastics FIG World Cup Series in Pesaro 2009 and All-around at the 2009 Grand Prix Final in Berlin. At the 2009 World Cup Series' last stage, she won the bronze medal in All-around, a silver medal for rope, and bronze medals for hoop, ball and ribbon in the finals.