She first gained recognition for her appearances on the children's television series Dancing with the Stars: Juniors (2018), where she finished as a runner-up with actor Miles Brown.
[4][5] Arnold was inspired to follow in the footsteps of her eldest sister, Lindsay, after watching her perform on the reality competition series Dancing with the Stars.
[8] On August 1, 2018, Arnold was announced as a professional dancer for the children's competition series Dancing with the Stars: Juniors; a spin-off of the main celebrity talent show franchise.
[16] Despite consistently earning low scores and criticism from the judges,[17] audience voters allowed the couple to stay in the competition until they were eliminated during the quarterfinals on November 21, 2023, finishing in sixth place.
[25] Conrad Green, its showrunner, noted that Arnold's ability to draw her own audience, especially among Generation Z, has turned her into a social media consultant to other celebrities and pros.