She followed Palau's advice and furthered her music studies with Professor Ernet Jarnack, with the Walker Wagenheim Orchestra and with the choral specialist, Rafael Benedito.

[4] Highlights of her early works include the research carried out in the Vall d'Albaida region where Oller visited all the towns while collecting songs such as the fandango of El Palomar or the dances of Bèlgida.

[4] From 1974, she began working exclusively as a transcriber with a team of compilers coordinated by musicologist Salvador Seguí Pérez [ca], which also included Fermín Pardo, Sebastián Garrido, Ricardo Pitarch, and José Luis López.

The Fundación Juan March financed this group through a grant made to the musicologist Salvador Seguí to travel to the different comarques of the province of Valencia to collect songs and melodies.

[4] In 1988, Oller and Pardo teamed up again to present to the Institució Valenciana d'Estudis i Investigació [ca] a monographic project dedicated to the singing of the mayos in the Valencian comarques.