In parliament, Fontenel-Personne served as member of the Defense Committee.

[2] In addition to her committee assignments, she was a member of the French-Montenegrin Parliamentary Friendship Group.

In July 2019, Fontenel-Personne decided not to align with her parliamentary group's majority and became of 52 LREM members who abstained from a vote on the French ratification of the European Union’s Comprehensive Economic and Trade Agreement (CETA) with Canada.

[3] In late 2019, Fontenel-Personne was one of 17 members of the Defense Committee who co-signed a letter to Prime Minister Édouard Philippe in which they warned that the 365 million euro ($406 million) sale of aerospace firm Groupe Latécoère to U.S. fund Searchlight Capital raised “questions about the preservation of know-how and France’s defense industry base” and urged government intervention.

Her daughter Julie Delpech was elected MP for Sarthe's 1st constituency.