Kelsey was born in Auckland, New Zealand, and later moved to the Gold Coast. She began dance classes at the age of five. She started classical training at the age of eleven, at Northern Dance Academy, and moved on to study full time at Prudence Bowen Atelier. In 2012 she won The McDonald College Scholarship Award at the Sydney Eisteddfod. She joined The Australian Ballet in 2014.
Kelsey's last year with The Australian Ballet was 2019.
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In her spare time, Kelsey likes to read and spend time at the beach.