After graduating from film school, Chelsea sold her first short film, Imaginary Friend, to ABC (Australia), which aired over a three-year period. She has since written multiple episodes of series television including The Doctor Blake Mysteries (BBC/ABC), Secret Bridesmaids' Business (Channel 4/7 Network), Miss Fisher’s Modern Murder Mysteries (Acorn TV/7 Network) and Troppo (Amazon Prime).

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In 2019, Chelsea's crime series Cloak received significant draft development funding from VicScreen, where she worked extensively with her future producer Simon Mirren (Versailles, Criminal Minds). 

Chelsea has had several original television concepts in development with various production companies, including Mediawan (France), Atlantic Nomad (UK), Easy Tiger (Australia) and most recently, Federation Entertainment (France). In 2020, her sci-fi series 'Yesterday' was selected for Imagine Impact - a global content accelerator program launched by Ron Howard and Brian Grazer. In 2022, her series 'The Others' was selected for the UGC Writers' Lab at Series Mania in Lille, France.