Loreto Valenzuela studied business engineering at the University of Chile's from 1972 to 1973 due to political considerations. After the 1973 military coup, a continuous persecution against leftist students began. The school was dissolved the same year, so she was forced to abandon her studies. Subsequently, she took secretarial and acting courses at the School of Communication Arts (EAC) of the Pontifical Catholic University, graduating in 1979.