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's original television concepts are all in active development with various production companies, including Mediawan (France), Federation Entertainment (France), Atlantic Nomad (UK), and Easy Tiger (Australia). In 2020 she was invited to join the Imagine Impact community - a global content accelerator program launched by Ron Howard and Brian Grazer. In 2022, she was invited to pitch her original drama concept on stage at Series Mania in Lille, France.