[4] She is also a two-time team silver medalist at the World Championships (in 2022 and 2023) Kolosov has been training at the federal base in Fellbach with Yuliya Raskina since 2016.

[6] Together with her sister, Margarita Kolosov started training rhythmic gymnastics at SC Potsdam in 2010, at the age of 6.

[8] In 2020, Margarita, together with numerous athletes, appeared in the music video by Tim Bendzko for the song "HOCH" (OLYMPIA TEAM D VERSION).

[11] At the first Junior World Championships in Rhythmic Gymnastics in Moscow in 2019, she placed 15th in the team event with Darja Varfolomeev.

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.

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.

[14] She started the 2022 season competing at World Cup Athens, where she won bronze with ball and silver with ribbon.

[17] Kolovosv 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.

[19] 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.