Dodin was born on 24 October 1996, in Lille, France. An only child, she played tennis with her parents. Her father, Frederic Dodin, was also her coach for a time. Her tennis idols are Maria Sharapova and Roger Federer. Dodin began playing on the ITF Circuit in July 2011 at the age of 14. She first participated at the $10K Valladolid tournament, where she get to the main-draw as a qualifier. Her first bigger improvement was in the March of the following year at the $10k Bron tournament after reaching her first semifinal.

She has won one singles title on the WTA Challenger Tour. She has also won four singles titles and four doubles titles on the ITF Circuit. On 18 October 2021, she reached her best singles ranking of world No. 99. On 19 June 2017, she peaked at No. 209 in the WTA doubles rankings. Playing for Poland Fed Cup team, Fręch has a win/loss record of 8–3.