In February 2009, Arneill made her professional wrestling debut at Pro Wrestling Women's Alliance (PWWA) as KC Cassidy,[6] and competed on the independent circuit with multiple promotions for several years, becoming a one-time PWA Women's Champion,[9] and winning the Vera and Jenny Memorial Cup in support of breast cancer.

She attended the same high school, Westfields Sports, as fellow wrestler and future tag team partner Jessie McKay.

[14] Cassidy made two appearances for the American all-female promotion Shimmer Women Athletes as Bambi Hall's tag team partner.

[30] Shortly after that, in the end of February, Royce defeated Ember Moon and Liv Morgan in a triple–threat to earn another opportunity at Asuka's NXT Women's Championship,[31][32] which she once again failed to win.

[51][52] Eventually, Naomi teamed up with Asuka but lost to The IIconics at the Super Show-Down on 6 October, held in the latter's homeland of Australia.

[53][54][55][56] Three weeks later, both Royce and Kay took part in WWE's first all-women's pay-per-view, Evolution; they were the first two eliminated from a battle royal for a future women's championship match.

[61][62][63] At the event, which took place on 7 April, The IIconics won the match after Kay pinned Bayley to win the Women's Tag Team Championship for the first time.

[64] On the 5 August episode of Raw, The IIconics lost the titles to Alexa Bliss and Nikki Cross in a fatal four-way match.

[65] After a brief hiatus, Royce and Kay made their return on the 11 May 2020 episode of Raw, interrupting WWE Women's Tag Team Champions Alexa Bliss and Nikki Cross.

[68] At Knockouts Knockdown on 9 October 2021, it was announced that The IIconics, now known as The IInspiration, would be making their debut for Impact Wrestling at Bound for Glory.

[69][70][71][72] At Bound for Glory, they defeated Decay (Havok and Rosemary) to win the Impact Knockouts World Tag Team Championship.

[76] On 16 May 2021, Arneill along with longtime tag team partner and best friend Jessica McKay launched a comedy and variety podcast titled Off Her Chops.

[77] In August 2019, McIntosh married Canadian wrestler Ronnie Arneill, best known by his ring names Shawn Spears and Tye Dillinger.