In 2007 Cousin switched club and started training with François Laurent, David Pierre Louis and Alain Nagera of the
Sankuno Academy Paris, all the while working as a
Police officer. Representing Behring Jiu Jitsu, she won gold at the
2007 IBJFF World Jiu-Jitsu Championship, taking place in Long Beach, California, beating favourite
Leticia Ribeiro of Gracie Humaita in the semi-final and
Sayaka Shioda in the final. Cousin became the first French and European BJJ black belt world champion, also finishing third in the
Open Class category. In 2010 following a back injury Cousin decided to step away from training and competing. Two years later, in 2012 she left Paris for
Toulouse in the south of France where she established, with her husband Erwan Fouillat, her own academy
Acemat. In 2013 Cousin returned to competition, winning gold at the IBJJF London International Open in the lightweight division and silver in Open Class, under team
Tropa de Elite. in 2014 Cousin became a member of brothers
Xande and Saulo Ribeiro BJJ team, making
Acemat their first French affiliation. Competing under
Acemat /
Ribeiro jiu-jitsu, Cousin won double gold at the 2014 London Open International (in both her division and in Open Class) followed by gold at the 2014
European Championship. In 2015 she won gold at the IBJJF World Master, bronze at the IBJJF European championship and competing in
Sport Ju-Jitsu, gold at the
JJIF Newaza No-Gi European Championships. In 2016 Cousin participated in
Polaris Pro 3 in England, won silver at the 2016 European championship then won silver at the 2016 World Master IBJJF Championship in her weight class and won bronze in the Open Class. In 2017 Cousin entered the European Master Championship winning bronze in two categories, the following year she won gold in both her division and in Open Class. In 2019 Cousin won the IBJJF World Master 2 in her weight division and silver in the Open Class as well as becoming for the second time double European Master Champion. In 2022 she became French JJIF Newaza Champion for the fourth time, Cousin won gold in January at the
2023 Brazilian Jiu-Jitsu European Championship competing in Master 2 featherweight division. == Brazilian Jiu-Jitsu competitive summary ==