Born in Madrid on 13 April 1988, she grew up in the neighborhood of Ventas. She is daughter of civil servants, her father having worked for the Tax Agency and her mother for the City Council. Graduated in political science at the Complutense University of Madrid she later took post-graduate studies in International Economy. She was a founder of the Juventud sin Futuro group in 2011 and took part in the 15-M protests. A collaborator in LaTuerkaTV show, she joined Podemos, helping in the party campaign for the 2014 European Parliament election. Following the October 2014 Podemos meeting in Vistalegre, Maestre became a member of the party's Citizen Council in the Constituent Assembly celebrated a month later. She ran 5th in the Ahora Madrid list for the May 2015 Madrid municipal election, being elected to the City Council. As Manuela Carmena was invested as the new Mayor on 13 June, Maestre was included in the municipal government board assuming the government area of "Spokeswomanship, Coordination of the Government Board and Relations with the Plenary". She also briefly held the councillery-presidency of the Salamanca district. Days after assuming office, she was charged with a transgression of "offense to religious feelings" due to her participation in a 2011 pro-laicist protest in the chapel of the UCM Faculty of Psychology, for which she was initially sentenced to pay 4,320 € in March 2016, ultimately being fully acquitted in December 2016 after appealing to a higher judicial instance. Maestre stood as challenger to the leadership of the regional organization of Podemos in the Community of Madrid. Considered linked to the errejonista faction, her candidature "Adelante Podemos" was beaten by Ramón Espinar's "Juntas Podemos" in the November 2016 primary election. Following the renouncement of Maestre and other 5 councillors members of Podemos and also members of the municipal group of Ahora Madrid to run in the Podemos process to select the candidates to the 2019 municipal election, preferring to directly do it instead in the Más Madrid platform around Carmena, all 6 councillors' individual memberships to Podemos were suspended in a precautionary basis in November 2018 after a request by Julio Rodríguez.
