Born in La Paz, Bolivia in 1981, Cajías studied at the Escuela de Cine y Artes Audiovisuales (ECA) and at Cuba’s San Antonio de los Baños’ International School of Film and Television. Back in Bolivia she worked in the cinematography of Hospital obrero (2009) by Germán Monje, Amarillo (2009) by Sergio Bastani and Los viejos (2011) by Martin Boulocq.