She competed for TSG Söflingen and was coached by Natalia Stsiapanava, Ekaterina Kotelikova and Vladimir Komkov.

Sergeeva grew up in Ulm and took up the sport at her home club, TSG Söflingen, initially, she was mainly active as an individual gymnast and she was the runner-up championship in the juniors with ball.

With Cathrin Puhl, Camilla Pfeffer, Sara Radman, Karolina Raskina and Mira Bimperling, she missed a medal in the team competition as Germany finished in 4th place behind Russia, Italy and Belarus.

[7] The World Championships in Moscow followed in the autumn of that year, where Sergeeva with Pfeffer, Puhl, Radman and Bimperling finished 8th in the team competition and 5th in the two apparatus finals.

At the World Championships a year later in Montpellier, she finished 6th with Camilla Pfeffer, Cathrin Puhl, Nicole Müller, Sara Radman and Mira Bimperling in the group All-Around, as well as 7th with 5 balls and 5th with 3 ribbons + 2 hoops.