Chapman competed in mountain bike events before transitioning to road racing. Sixth place at the Australian National Road Championships in 2018 led to her selection for the Herald Sun Tour.[6] She won the first stage and the overall at the Herald Sun Tour. After this victory she joined Tibco–Silicon Valley Bank for the 2018 season.[7] In 2019 Chapman won two stages, the Queen of the Mountains jersey and overall victory at the Tour of the Gila.[8]
Chapman joined the French team FDJ Nouvelle-Aquitaine Futuroscope at the start of the 2020 season.[9] She started the 2020 season with victory in the inaugural edition of Race Torquay.[10] In 2023 she joined the Trek-Segafredo team and won the road race at the National Road Championships. Chapman has signed a two-year contract to join UAE Team ADQ in 2025.[11]