Born in Algeciras, province of Cádiz, Nieto graduated in Political Sciences from the University of Granada and obtained a master's degree in Public Administration. She was a staff member for the United Left (IU) in the Algeciras City Hall from 1997 to 2007, when she was elected deputy mayor, also being Councillor for Culture and Festivals.[1]
Unidas Podemos took part in the 2022 Andalusian regional election, with Nieto as lead candidate and under the name Por Andalucía.[5] Compared to the 17 seats taken by the first Adelante Andalucía in 2018, its successors took 7 in 2022 – five for Nieto's coalition and two from Rodríguez's.[6]