She is also a Sports Illustrated swimsuit model and current member of the LSU Tigers women's gymnastics team.

[5] By the time she was 14 years old, Dunne was homeschooled by her mother, using the Abeka Academy curriculum,[6] while she spent her days training with her coach Craig Zappa at ENA Gymnastics.

[9] In 2015, Dunne re-qualified for elite status at the WOGA Classic, where she earned a qualifying score of 52.750 and placed fifth.

Although the United States did not send a team, Dunne represented her club at the 2018 City of Jesolo Trophy.

[35] At the SEC Championships, she contributed an uneven bars score of 9.875, but LSU was forced to count a fall on that event and finished in fifth place overall.

[37] LSU suffered two uncharacteristic falls on balance beam and as a result was eliminated from the postseason during the first round of regionals, failing to qualify for the national championship as a team for the first time since 2011.

[40] She also competed on the uneven bars twice, including at the SEC Championships, where LSU won the team title.

On July 2, 2021, the NCAA changed its rule to allow its athletes to earn money from their name, image, and likeness (NIL).

[44] Dunne was projected to earn more than any other collegiate athlete due to her large social-media platform, which was a combined five million followers across both Instagram and TikTok at the time of the rule change.

[47] As of May 2023, Dunne was the highest-valued women's college athlete with an estimated NIL valuation of $3.3 million,[48] which led to endorsement deals with Grubhub, Vuori, Bodyarmor, and American Eagle Outfitters.

In February 2023, she stated during an appearance on the morning program Today that her endorsement deals total seven figures.

[2] On January 6, 2023, a large group of fans showed up to LSU's opening meet of the season at Utah to support Dunne.

[49] On February 27, 2023, Dunne posted a paid-sponsorship video to TikTok promoting Caktus.AI with the caption, "Needing to get my creativity flowing for my essay due at midnight".

[52] Later that month, Dunne announced that she had partnered with Bayou Traditions to launch The Livvy Fund, a program that will connect female student athletes at LSU with top brands to secure NIL endorsement deals.