From 2011 to 2023, she was a city councillor in Bilbao, for the Basque Nationalist Party (PNV).

Born in Bilbao, Agirregoitia completed an engineering degree at the University of Deusto.

Her responsibilities on the council included consumption, equality, youth, sports and citizen participation.

[2] Mayor Juan Mari Aburto awarded her the Medal of the City at the end of her service.

[3] Ahead of the 2024 European Parliament election in Spain, the PNV chose Agirregoitia as its lead candidate on the list of the Coalition for a Solidary Europe (CEUS), a coalition with other peripheral nationalist parties.