At fifteen years old, she won two gold medals in team competition and combo routine at the 2005 World Aquatics Championships.

[5] After the 2019 World Aquatics Championships in Gwangju, South Korea, Romashina became the most awarded athlete in the history of synchronized swimming with 21 gold medals.

She surpassed her compatriot, Natalia Ishchenko, who holds 19 gold medals from the World Championships.

[7][8][9] She also won the duet event at London and Rio de Janeiro with Natalia Ishchenko.

At the 2020 Summer Olympics, held in Tokyo in 2021, Romashina partnered with Svetlana Kolesnichenko and won the duet event.