In 2016, Groizeleau officiated an under-20s match between France and England. In November 2017, Groizeleau was the assistant referee for two matches between France and New Zealand. In November 2018, Groizeleau officiated her first international rugby match, between Italy and South Africa. Groizeleau was chosen to officiate at the 2019 Women's Six Nations Championship; her first match in the competition was the March 2019 match between England and Italy. At the time of her appointment, she was one of six female international referees. She was selected as an official for the 2020 Women's Six Nations Championship, initially for two matches as main referee, and two matches as assistant referee. Later in the year, she was chosen to referee a match between France and England, after Irish official Joy Neville was injured. Groizeleau was selected as an official for the 2021 Women's Six Nations Championship, for two matches as main referee, and one match as an assistant referee.