Guerrero began her career as a radio personality. She was noted for being able to do voice acting for various actors – "man, woman, boy, girl, and the elderly". Her name Matutina came from a character she portrayed in a soap brand's radio commercial. She was scouted by director Ading Fernando who cast her without auditioning for his sitcom project. This project turned out to be
John en Marsha, starring
Dolphy and
Nida Blanca as the titular husband-and-wife and aired on
RPN-9 from 1973 to 1990, with a short hiatus from 1978 to 1980, where she played Matutina, the squeaky-voiced maid and sidekick of Donya Delilah G. Jones (
Dely Atay-atayan). Her character became her screen name because she wanted to differentiate the voice she used in the sitcom from her radio projects. ==Politics==