In May 2020, she was one of the 17 initial members of the short-lived Ecology Democracy Solidarity group.

[3] In addition to her committee assignments, she chaired the French Parliamentary Friendship Group with South Sudan.

[4] In 2018, Chapelier 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.

[5] In June 2019, Chapelier was one of five members of the LREM parliamentary group who joined a cross-party initiative to legalize the distribution and use of cannabis.

[6][7] In July 2019, Chapelier voted in favour of the French ratification of the European Union’s Comprehensive Economic and Trade Agreement (CETA) with Canada.