Cosman was born on August 6, 2007[1] in Lansing, Michigan,[2] as a dual citizen of the United States and Romania. Her parents were both born in Romania and immigrated to the United States in 2001.[3] She began gymnastics at the age of four because her older sister was also a gymnast.[4]
2022–23: Junior competitions
Cosman moved to Deva, Romania, at age 15, in 2022 and joined the Romanian national team.[5][6] She began training under coach Liliana Cosma.[7] At the 2022 Romanian Championships, she became the national champion on the uneven bars and also placed fifth in the all-around and on the balance beam.[8] She then competed at the Gymnova Cup held in Keerbergen, Belgium, placing fourth in the all-around and winning a bronze medal in the team competition.[9] Then at the Romanian Junior Individual Championships, she won a bronze medal in the all-around and silver medals on the vault and uneven bars.[10]
2023–present: Senior competitions
Cosman became age-eligible for senior international competitions in 2023. She made her senior international debut at the 2023 European Championships and contributed on the vault and uneven bars toward Romania's fifth-place finish.[11] She won the bronze medal in the all-around at the Romanian Championships behind Ana Bărbosu and Sabrina Voinea, and she won a silver medal in the balance beam final.[12] She competed at the Heidelberg Friendly with the Romanian team that won a silver medal behind Germany.[13] She was selected to compete at the 2023 World Championships alongside Bărbosu, Voinea, Amalia Ghigoarță, and Andreea Preda. The team finished in tenth place, earning Romania a team berth for the Olympic Games for the first time since 2012.[14][15]