[3] Following the 2017 elections, Louwagie served as one of the eleven deputy chairpersons of the Republicans' parliamentary group, under the leadership of chairman Christian Jacob.

In the Republicans’ 2016 presidential primaries, Louwagie endorsed François Fillon as the party's candidate for the office of President of France.

[6] Following Jacob's election as LR chairman, Louwagie announced her candidacy to succeed him as leader of the party's parliamentary group.

[7] In 2023, the Republicans' chairman Éric Ciotti appointed Louwagie as member of his shadow cabinet and put her in charge of the party's positions on the national budget.

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