A member of the Madrid City Council since 2015, she served as Spokesperson of the municipal government board presided by Manuela Carmena from 2015 to 2019.

[1][3] A collaborator in LaTuerka TV show, she joined Podemos, helping in the party campaign for the 2014 European Parliament election.

[1] 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.

[6] 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,[7] for which she was initially sentenced to pay 4,320 € in March 2016,[8] ultimately being fully acquitted in December 2016 after appealing to a higher judicial instance.

Even though Más Madrid won the elections, Carmena could not continue as mayor of the capital of Spain due to a pact to form a coalition government made by the People’s Party, Citizens and Vox.