Junior
In August 2016, Kolosov moved from SC Potsdam to the federal training base in Fellbach. [13] From 2017 to 2019, she was German Junior Champion in the all-around. While she won only one final in 2017, she won all four gold medals in the following two years. [14]
In 2018, she and Emeli Erbes competed at the 2018 European Championships in Guadalajara, Spain. Since the German senior group retired shortly before the competition, they could not participate in the team category, which required a senior group. Kolosov was 14th in the all-around among the juniors. [15]
Senior
In 2020, due to the COVID-19 pandemic, Kolosov was only able to take part in a few competitions in her first senior season. In 2021 she competed for the first time at the German Rhythmic Gymnastics Championships in the senior category and won all the gold medals in the individual competitions. [16] At her first European Senior Championships in Varna, she qualified for the all-round final, finishing 24th. She also reached the all-around final at the World Championships in Kitakyūshū and finished 16th, the best result of a German individual gymnast since 2013. [17] At the end of the year, she and the team of the Berlin TSC finished second in the rhythmic gymnastics bundesliga. [18]
2022
She started the 2022 season competing at World Cup Athens, where she won bronze with ball and silver with ribbon. At the World Cup in Sofia, she finished 11th in the all-around and 8th in the ball final. In Tashkent, she was 4th in the all-around behind her teammate Darja Varfolomeev as well as in the hoop final. She won Germany's first World Cup gold medal in the ball final. [19] She also earned silver with clubs and was 5th in the ribbon final. In Pamplona, she ended 9th in the all-around, qualifying only for the ball final, where she ended in 8th, and hoop, where she won gold. [20] In June she competed alongside Helena Ripken in Pesaro, where she was 7th in the all-around and 4th in the ball final. [21]
Kolosov then competed at the European Championships in Tel Aviv, along with Varfolomeev, the senior group and the two juniors Lada Pusch and Anna-Maria Shatokhin; she was 15th in the all-around, 7th with hoop, 5th with ball, and 29th with ribbon. [22] At the World Cup in Cluj-Napoca, she was 18th in the all-around and didn't qualify for finals. [23] Kolosov was also selected for the World Championships in Sofia along with Varfolomeev and the senior group, where she won silver in the team event. [24]
2023
In 2023 she showed her clubs routine in the Italian clubs championship's first stage, where she competed for Pontevecchio Bologna. [25] In March she won silver in the all-around at the Fellnach-Schmiden Tournament and qualified for all four apparatus finals. In the finals, she also won silver with ribbon and ball. [26] At the first World Cup of the season in Athens, she made some mistakes and qualified only for the ribbon and clubs finals. She finished 8th in the ribbon final and won gold with the clubs. [27]
At the 2023 World Championships, she was 12th in the all-around final and qualified for the hoop and ball finals, and she and the rest of the German team won silver in the team segment. [28] Her all-around placement qualified Germany a second quota for the 2024 Summer Olympics. [29]
2024
Kolosov competed at the 2024 European Championships in Budapest. She came in 7th in the all-around final and qualified for the clubs final; however, in the clubs final, she dropped her apparatus twice and finished in 8th place. [30] At the 2024 German national championships, Kolosov became the all-around champion ahead of Varfolomeev, a result that was considered surprising as Varfolomeev was the 2023 World champion in every individual category. [7] The next day, during the apparatus finals, she won gold in the ball final and silver medals in hoop, cubs and ribbon. [31]
At the World Cup in Milan, Kolosov came in fifth overall after a loss of apparatus in her clubs routine. She competed in three of the four apparatus finals and came in fourth with clubs, fifth with ribbon, and eighth with ball. [32]
In August, she competed at the 2024 Summer Olympics. She qualified for the final, where she came in fourth place after improving on her qualification scores. She ended narrowly behind Sofia Raffaeli, who won the bronze. [33] Fellow German Darja Varfolomeev, the gold medalist, comforted her afterward. [34]
2025
The next year, she competed at International tournament Gdynia Rhythmic Stars in Poland, taking 9th place in all-around and silver medal in ribbon final. [35] In May, she and Varfolomeev were awarded the German Gymnastics Federation's Flatow Medal, which honors the memories of Alfred Flatow and Gustav Flatow, at the Turnfest Festival in Leipzig, Germany. [36]
Kolosov was selected to compete at the 2025 Summer World University Games along with her teammate Anastasia Simakova. This was the first time that Germany had sent a team of rhythmic gymnasts to the event. [37] She took 15th place in the all-around due to many mistakes in her routines and was therefore not satisfied with the result. [38] However, the next day, she won a historic gold medal in the ball final. [39]
In August, she took fourth place behind Viktoria Steinfeld at the 2025 German National Championships. [40] In the apparatus finals, she won silver with hoop and bronze with ribbon. [41] She was initially selected to represent Germany at the 2025 World Championships in Rio de Janeiro, but she was later replaced by Anastasia Simakova.
Germany 
