[3] On the Committee on Social Affairs, she was her parliamentary group's co-rapporteur on the government's pension reform plans since 2020, alongside Guillaume Gouffier-Cha, Jacques Maire and Corinne Vignon.

[4] In addition to her committee assignments, Grandjean was a member of the French-British Parliamentary Friendship Group.

In October 2023, Grandjean participated in the first joint cabinet retreat of the German and French governments in Hamburg, chaired by Chancellor Olaf Scholz and President Emmanuel Macron.

[5][6] In 2018, Grandjean joined other co-signatories around Sébastien Nadot in officially filing a request for a commission of inquiry into the legality of French weapons sales to the Saudi-led coalition fighting in Yemen, days before an official visit of Saudi Crown Prince Mohammed bin Salman to Paris.

[7][8] In July 2019, Grandjean voted in favor of the French ratification of the European Union’s Comprehensive Economic and Trade Agreement (CETA) with Canada.