Lily Ramonatxo started rhythmic gymnastics at 8 years old after watching the 2011 World Rhythmic Gymnastics Championships in her hometown, Montpellier. She began her career with coach Sandrine Cabrera in Montpellier 3M GRS club, before switching with Alexandra Konova when she joined the national youth training hub in the same city.
Her first competition as a national team member was the International Tournament in Corbeil-Essonnes, France.[3] The next year, she won the silver medal in the all-around at the French national junior championships, along with a gold in the ribbon final and a bronze with clubs.[4]
Thanks to her results, she was selected to represent France at the 2019 Junior World Rhythmic Gymnastics Championships in Moscow, Russia. She competed with the rope, and finished 23rd with a score of 13.950.[5]
In 2020, her last junior season, she won silver with clubs at the Corbeil-Essonnes International tournament. She also won three medals at the Fellbach Schmiden tournament in Germany: two silvers with ribbon and clubs, and a bronze with ball.[6] Due to the COVID-19 pandemic, most of the events in the season were cancelled. Her final junior competition was the 2020 Rhythmic Gymnastics European Championships in Kyiv, postponed in November. With her teammate Elsa Somville and the group, she finished 4th in the team competition. She qualified to three finals: she finished 7th with rope and clubs and 8th with ball.[7]
In 2021, she started competing as a senior. She debuted on international level at Baku World Cup, where she was 45th in All-around. Later, she competed at Challenge Cup in Cluj-Napoca, Romania, where she ended on 12th place in All-around. She qualified to her first Apparatus final - Ball, and took 7th place.
In 2022, she began her season at Palaio Faliro World Cup and took 7th place in all-around. She qualified to two apparatus finals, finishing 6th in ball and 5th in ribbon. At Sofia World Cup she was 13th in all-around and did not advance into any apparatus finals (9th in clubs and ribbon). She represented France at the 2022 European Championships in Tel Aviv and placed 24th in all-around competition.[8] Together with Hélène Karbanov they placed 7th in team competition.
In Autumn 2024, she moved to Udine, Italy to train at Associazione Sportiva Udinese under guidance of Italian coach Špela Dragaš.
In 2025, she began her season at Sofia World Cup in April, where she took 47th place in all-around. She was most successful with clubs (20th place). Then she competed at Tashkent World Cup and took 26th place in all-around. She was 14th with Clubs. On May 15-18, she competed at European Cup in Burgas, Bulgaria. She took 4th place in Hoop, 18th place in Ball, 10th place in Clubs and 11th place in Ribbon. She won silver medal in all-around behind Maëna Millon at French National Championships in Paris.[9] In finals, she won gold in clubs and ribbon finals and silver in hoop and ball finals.[10] In June, Lily represented France together with Maena Millon at the 2025 European Championships in Tallinn, France. She placed 19th in all-around final.[11] They took 9th place in team competition together with senior group. In July, she competed at World Challenge Cup Cluj-Napoca, and took 24th place in all-around.[12]
In August, Lily and Maena represented France at the 2025 World Championships in Rio de Janeiro, Brazil. Lily ended on 37th place in all-around qualifications. This was her first World Championship.
In 2026, she competed at Thiais Grand Prix and took 7th place in all-around. She was 6th in both ball and ribbon finals.[13] She announced her retirement right after, performing at a gala.
France 
