Fatton competed at the
2023 World Championship of Ski Mountaineering and won a silver medal in the sprint race with a time of 3:14.005. In March 2025, she competed at the
2025 World Championship of Ski Mountaineering and won a gold medal in the sprint race, with a time of 3:20.96. With the win, she earned a quota spot for the discipline at the
2026 Winter Olympics. She also won a bronze medal in the mixed relay, along with
Robin Bussard, with a time of 33:02.9. On 19 February 2026, Fatton won the first-ever Olympic gold medal in
ski mountaineering, finishing in first place in the
sprint race with a time of 2:59.77. On 21 February 2026, she won a silver medal in the
mixed relay, along with
Jon Kistler, with a time of 27:09.30. ==Personal life==