[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.

She won the primaries to Marta Higueras, becoming the leader of the opposition to government of the conservative mayor José Luis Martínez-Almeida.