She is the daughter of Manuel Matias, former president of the Citizenship and Christian Democracy Party (PPV), which merged with Chega in 2019.

At the 4th congress of Chega, she said that Portugal is "gagged and imprisoned" by "Marxist webs", crushed by the weight of the State, with a new generation addicted to a "cancel culture" that makes "white males and heterosexuals as oppressors".

[4][5][7][6] Matias has described her political inspiration as coming from the right-wing female politicians, Giorgia Meloni in Italy and Rocío Monasterio in Spain.

[8][4] On 16 June 2024, at a press conference prior to a match in the UEFA Euro 2024 football (soccer) championship, the French footballer Kylian Mbappé, who has Cameroonian and Algerian parents, encouraged young people in France to vote in the 2024 French legislative election in order to combat extremism, saying "I want to be proud to represent France; I don’t want to represent a country that doesn’t correspond to my values, or our values."

Matias responded to this by writing on X (formerly Twitter) "France for the French" and by suggesting that Mbappé had put his nose where it did not belong.