Jimena took up the sport at age 5.[2]
2022
In July 2022 she competed in the Junior Pan American Championships in Rio de Janeiro, taking 11th place in the All-Around, 11th with hoop, 16th with ball, 20th with clubs.[3][4] In November of the same year she won bronze in teams along Maria Victoria Escobar and Gabriela Rodríguez at the South American Championships in Paipa.[5]
2023
In 2023 she took part in the Pan American Championships in Guadalajara, being 6th in teams, 8th in the All-Around and 7th with hoop.[6][7][8] In July she was selected for the Junior World Championships in Cluj-Napoca, taking 34th place with hoop, 49th with ball, 43rd with clubs and 37th with ribbon.[9] In November Dominguez won bronze in teams (with Luciana Caraballo and Samantha Rojas) and with ball, as well as gold with hoop, clubs and ribbon, at the Junior South American Championships in Asunción.[10]
2024
In 2024 she competed at the Pan American Championships in Guatemala City, she was 8th in the All-Around, 4th with hoop, 5th with clubs 5th in teams and won bronze in the ribbon final.[11][12][13]
In December 2024 she participated in the 2024 Junior South American Rhythmic Gymnastics Championships, in Aracaju, Brazil, winning a historic gold medal in the all-around, as well as 3 more gold medals in the hoop, ball and clubs, finals and a silver in the ribbon final.[14][15]
2025
In June of 2025, she participated in the 2025 Pan American Championships in Asunción, finishing 6th in the all-around, 8th in clubs and ribbon.[16] In July, she participated in Milan World Cup, finishing 47th in the All-Around. The next month in August, she made her World Championships debut in Rio de Janeiro, finishing 58th in the All-Around.[17]
In September, she participated in the 2025 South American Rhythmic Gymnastics Championships, in Cochabamba, Bolivia, winning a historic gold medal in the All-Around, being the first Venezuelan gymnast to do so. She won a bronze medal in both the hoop and clubs finals, and placed 4th in the ball and 5th in ribbon.
Venezuela 
Venezuela 
