Petitjean was born in Niger to a Togolese mother and spent the majority of her life in Haute-Savoie, France, where she learned to ski.[2] Petitjean's maternal lineage allowed her the opportunity to compete for Togo.[8]
Mathilde-Amivi Petitjean placed 59th in the Women's sprint event,[9] and 83rd in the Women's 10 km freestyle.[10] Petijean joined a record number of Africans attending the Winter Olympics.[11] After competing, she said that she would like to see winter sports taken up by more Africans.[12]