Petrina was a close associate of George Miller's for many years, working alongside Miller and his producing partner, Doug Mitchell at their prestigious production company Kennedy Miller Mitchell for over a decade. Throughout her tenure, she had significant roles on some of the company's most ambitious and successful films, including MAD MAX: FURY ROAD and HAPPY FEET. She also helped develop Miller's upcoming Mad Max installment FURIOSA, and MAD MAX: THE WASTELAND. After leaving KMM, Petrina spent four years in London developing a slate of projects under her company banner, Sensuble Productions, whilst mentoring writers as a script and development consultant. Petrina joined Odin’s Eye Entertainment in late 2023 as Director of Development and Acquisitions.