[1] Her father, Antonio Casteleiro Naveiras, was a soldier from Mugardos, A Coruña, who served in the Spanish Air Force during the Franco era.
[2][3] She studied Philosophy and Educational Sciences at the Complutense University of Madrid, and she has taken various training courses in the fields of intelligence and human resources.
[7] She has held various key positions in these agencies,[8] including leading the counterintelligence division[9] and the human resources management department at CNI.
[13] In early 2020 she was reported to be a possible candidate to replace Félix Sanz Roldán as head of the CNI,[5] but instead, the government appointed the agency's secretary-general at the time, Paz Esteban López.
[16] In a meeting on 10 May 2022, the Council of Ministers appointed her director of the CNI, replacing Paz Esteban López following the Pegasus spyware scandal, CatalanGate.