Mallada was born in Cabañaquinta, Asturias to a local father and a mother from the Province of Jaén in Andalusia. She studied Advanced Mining Engineering at the University of Oviedo and began working at a gold mine, before joining the public mining corporation Hunosa initially on an internship in 1999.[1]
In February 2012, Mallada became president of Hunosa.[2] She was the youngest person and first woman to hold the position. She left the corporation's presidency in July 2018 and was one of 164 employees who went into early retirement a year later when she was 46; unions and the state had agreed that those soon to be aged 51 could have early retirement due to the danger of the job.[3]
Mallada was personally chosen by PP president Pablo Casado to lead the party in the 2019 Asturian regional election, having polled better than the previous lead candidate Mercedes Fernández.[4] The party came second, dropping one seat to ten.[5] Mallada's selection ahead of Fernández led to a leadership crisis in the Asturian PP, ending when the latter accepted a place in the Senate; the party' regional presidency remained vacant until Mallada assumed it in October 2020.[6]