Forteza was chosen as a candidate for La République En Marche! in May 2017 for the second constituency for French residents overseas. On 17 June she was elected with 60.92% of the vote, defeating Sergio Coronado of Europe Ecology – The Greens. The abstention rate was 87.53%, compared to 84.45% in the 2012 elections. In parliament, Forteza serves as member of the Committee on Economical Affairs. In addition to her committee assignments, she is part of the parliamentary friendship groups with Argentina and Brazil.
Legislative activity
In August 2017, Forteza is designated to be responsible for the bills aiming to give back trust in political life. In 2018, she co-created, with French deputy Matthieu Orphelin, a website allowing citizens to ask questions, some of which later asked to the French Government. The same year, she is nominated rapporteur of the Personal data protection bill which integrates into French law the General Data Protection Regulation. On this occasion, she publicly denounced the "commercialization of personnal datas". During 2019 spring, she is in the running for the position of Minister of State for Digital, finally vested in Cedric O: according to Le Figaro, she would have been "more centrered on revitalizing democracy with digital tools, or protecting personal datas". In October 2019, she is nominated co-rapporteur of a parliamentary mission on the "digital identity". In January 2020, she remits to the Government a parliamentary report of the French strategy for quantic technologies, containing 37 public recommendations out of 50.
Critics and departure from LREM
On January 28, 2020, she announces her departure from La République en marche on a French national radio: having explained the lack of consideration for left and ecological issues, she expresses a deep disagreement on the political method used by the party, which "rewards friendships more than competencies". She became a non-attached member at the French National Assembly and called for the creation of a new "ecologist and progressist" political group. In May 2020, she was one of the 17 initial members of the Ecology Democracy Solidarity group.
2020 municipal elections in Paris
She supports the dissenting candidacy of Cédric Villany for the 2020 municipal elections in Paris, and campaigns in the 19tharrondissement of Paris. She obtained 5,82% of the vote during the first ballot.