Nelly Clastrier entered first at National Regional Conservatory of Marseille at 16 years old. In Paris, at 19 years old, she is admitted to the competition of the  prestigious free class at the Cours Florent. During an audition, she is spotted by Jérôme Savary.

At 22 years old, she plays at the National Chaillot Theater and the Mogador Theater. 

She founded Artist’s 100 Façons of which she is artistic director and producer. Her first creation is the show "Via Ma Vie".
That project is supported by the A.M.I. at La Friche de La Belle de Mai, Marseille. 

She is realizing "ILS" with her company. All the team is leaving in Sud Region. It's a low budget. Many international festival loves this short-film.

2025, Nelly is writing "Never Again" or Nam.  The team is from Marseille and Paris. It is a social message. It's more a pilot for a feathure than a really a short-film.

She writes play, poesy, and 4 scripts. 

Many have considered her in the drama for the authors Paul Claudel, Bernard-Marie Koltès or Jean Racine.

Yet, on her side, she is passionate about comedy. In her opinion, this is the most difficult to succeed in.