[10] Scouted to join the entertainment industry at an early age, Oineza's first appearances on television began as a child model in over twenty TV commercials for various product brands.
She soon came to prominence by joining the children's sketch comedy gag show Goin' Bulilit in various skits and parody roles.
[17] Since then, Oineza became a staple for local soap operas, appearing in supporting and guest roles in Ligaw na Bulaklak (2008), Maria la del Barrio (2011), Oka Tokat (2012).
Oineza materialized on the big screen with her first indie short in Sampalataya for Philippine's 2009 Urban Mediamakers Film Festival Entry, playing the role of a blind girl who dreams in colors but sees everything in black and white.
[19] She also participated in the period indie, Bayaning Pepe, a film under the direction of Carlos Morales, encompassing a story traced back into the younger years of National Hero Jose Rizal.
She received rave reviews from independent film critics as she played the infamous Leonor Rivera, Rizal's "lover by correspondence".
[20][21] In 2013, Oineza gained international recognition for her performance in the drama anthology Maalaala Mo Kaya for the episode "Manika" (lit.
[23][24][25][26] Oineza played the role Nene, a girl raped by her stepfather, witnesses her mother succumb to drug addiction and escapes to a convent.
[30] Separately, she appeared in another Maalaala Mo Kaya episode "Bimpo" where she played a young woman born with cerebral palsy.
In 2018, Oineza cuts her hair short to play an antagonist role in the afternoon teleserye Araw Gabi.