[3] As a child, she attended Hermitage Academy in Helensburgh, Dunbartonshire,[4] and gained an interest in contact sports at aged nine after enrolling in taekwondo classes with her younger sister.
[11] She started 2018 with a first-round technical knockout (TKO) win over Klaudia Vigh in January,[12] before facing Sarah Turunen for her first professional title on 16 June 2018, at the Lagoon Leisure Centre in Paisley, Scotland.
[14] In her next fight, Rankin made a second attempt at world honours on 17 November 2018, against two-time Olympic gold medalist and reigning unified WBA and IBF female middleweight champion, Claressa Shields, with the vacant WBC title also up for grabs.
[21] After a six-round unanimous decision win over Erin Toughill in a non-title bout in October, Rankin made the first defence of her title against undefeated WBC interim champion Patricia Berghult on 27 November 2019, at the Hotel Intercontinental in St. Julian's, Malta.
[24] Rankin attempted to become a three-time world champion when she took on Slovenia's Ema Kozin for the vacant WBC and WBO female super-welterweight titles in Manchester on 18 November 2023 but lost by split decision.
[26][27] She made her debut for the promotion at BKFC on DAZN: Tenaglia vs. Soto in Marbella, Spain, on 12 October 2024, with a five-round split decision win over Deborah Melhorn.