Sergeeva won silver in all-around at the 2015 Budapest Junior World Cup and with Team Russia winning the gold (with teammates Alina Ermolova, Daria Pridannikova and Anna Sokolova).

She also won team gold (with Daria Pridannikova, Alina Ermolova, Anna Sokolova) at the Junior World Cup in Kazan.

She then competed at the MTM Ljubljana Tournament where she finished 4th in the all-around, Sergeeva qualified in the apparatus finals in ball: 4th place and ribbon: silver medal.

In 2018, Sergeeva started the season with a competition at the 2018 Moscow Senior International tournament finishing 4th in the all-around behind Anastasiia Salos.

On April 7–8, she competed at the RG Tournament Irina Cup in Warsaw, Poland where she won gold in the all-around with a total of 71.200 points.