Previously, from 2007 to 2011 and again in 2015, Moreau served as a member of the Buenos Aires Province Chamber of Deputies elected in the First Electoral Section.

[1] She is the daughter of Leopoldo Moreau, a prominent Radical Civic Union leader who served as president of the Argentine Chamber of Deputies and as the UCR's presidential candidate in 2003.

[8][9] Moreau ran again for a second term in 2019, this time as the sixth candidate in the Frente de Todos list, following the agreement between the Renewal Front and other sectors of Peronism.

[13] At the 2023 general election, she was re-elected to a third term as National Deputy for Buenos Aires Province as part of the Union for the Homeland (UP) list, where she was in 4th place.

[14] Moreau was a vocal supporter of the legalisation of abortion in Argentina, and voted consistently in favour of the two Voluntary Interruption of Pregnancy bills, in 2018 and 2020.

[15] During the 2020 debate in the parliamentary commission on general legislation, Moreau spoke on how she carried out a clandestine abortion when she was 16, and how the experience motivated her to vote in favour of the bill.