Mitchell’s talent saw her head to Boras, Sweden, last month, to compete alongside 500 other female amateur boxers in the Golden Girl Championships.
The teen boxer said she was “overwhelmed with joy” after emerging victorious.
She has also represented England and, in November 2025, won the National Association of Boys and Girls Clubs Boxing Championships.
Mitchell is sharing her story as part of Brighton & Hove City Council’s (BHCC) Sport Lifts Her Higher campaign, which aims to increase female participation and celebrate achievement.
“There are so many women out there now that are so visible compared to before, and that now helps someone like me have something to aspire to,” she said.