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 Freevee).

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In 2022, Chelsea's series 'The Others' was selected for the UGC Writers' Lab at Series Mania in Lille, France. In 2023, Chelsea's original, unproduced crime series won the best TV pilot screenplay at the Prix Royal: Paris Screenplay Awards and was a finalist at the New York International Screenplay Awards, Swedish International Film Festival and the Fabrique Du Cinema Awards in Rome. Chelsea's series 'Cloak' received significant draft development funding from VicScreen, where she worked with producer Simon Mirren (Versailles, Criminal Minds).

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Chelsea's original television and film concepts have engaged various production companies, including Mediawan (France), Federation Studios (France) and Atlantic Nomad (UK), and in Australia: Easy Tiger, Hoodlum Entertainment, Princess Pictures, Curio Pictures and Seven Studios.