In addition to her committee assignments, she is also a member of the French delegation to the Parliamentary Assembly of the Council of Europe (PACE).

In July 2019, Gaillot voted against the ratification of the CETA: while she welcomed the progress achieved by the majority, she held that the text "does not go in the direction of history" and that global warming should prompt countries to develop short circuits rather than international free trade.

[5] On 9 September 2019, Gaillot announced that she would withdraw from the LREM group in the Assembly and was now sitting among its affiliated members: in a letter, she deplored the vote on "laws restricting individual freedoms".

In November 2019, Gaillot co-signed a platform with ten other LREM MPs to oppose the government's immigration measures concerning health, including state medical aid (AME), pleading not to give up "To urgency and ease".

[9][2] By June, she and five other ex-LREM deputies announced the establishment of #Nous Demain, a "humanist, ecologist and feminist" political movement.