[5][6][7] As of April 2024, she is ranked as the number two female featherweight (57.153 kg) Muay Thai contender in the world by the WBC Muaythai.
[9][11] In early 2021, Sundell was ranked the number one female featherweight (57.153 kg) Muay Thai practitioner in the world by the WBC Muaythai at 16 years of age.
[9][12] She has notable victories over decorated champion Sawsing Sor Sopit, Ponpan Por.Muengpetch, and male fighter Bongsak Sitpholek.
[1][13] In her ONE Championship debut at ONE: Full Circle on 25 February 2022, Sundell faced Australia's Diandra Martin.
[10] Sundell faced Jackie Buntan for the inaugural ONE Women's Strawweight Muay Thai World Championship at ONE 156 on 22 April 2022.
[16][17][18] Sundell won by unanimous decision, making her the youngest person to ever win a world title.