Groizeleau started officiating at the age of 21.[2] She was initially an assistant referee, before becoming a main referee.[5] She started her career in the men's Fédérale 2 league,[4] and now officiates in the men's Fédérale 1 and Top 14 leagues, as well as the French women's Premier Division.[6] She also officiates Rugby Europe Women's Sevensrugby sevens matches.[7] When she started officiating rugby union matches, she was one of four fully qualified French female referees.[8] Groizeleau is coached by French male referee Jérôme Garcès.[2][9]
In 2016, Groizeleau officiated an under-20s match between France and England.[6] In November 2017, Groizeleau was the assistant referee for two matches between France and New Zealand.[7] In November 2018, Groizeleau officiated her first international rugby match, between Italy and South Africa.[3] Groizeleau was chosen to officiate at the 2019 Women's Six Nations Championship;[10] her first match in the competition was the March 2019 match between England and Italy.[4][10] At the time of her appointment, she was one of six female international referees.[4] 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.[11][12] Later in the year, she was chosen to referee a match between France and England, after Irish official Joy Neville was injured.[6] 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.[13]
Groizeleau is from La Rochelle, Charente-Maritime,[6] and now lives in Marans, Charente-Maritime.[4] Aside from rugby, Groizeleau works as a farmer;[4] she breeds almost 7,000 pairs of pigeons at her parents' house.[6] Groizeleau spends three hours a week studying English.[4] Her partner is a rugby union assistant referee in the men's Rugby Pro D2 and Fédérale 1 leagues.[7] Groizeleau has one daughter.[4]