The 18-year-old from Peckham rode Haverland in the Magnolia Cup, a women-only charity race, and beat the likes of Olympic champion cyclist Victoria Pendleton and model Vogue Williams.
Mellah raced less than four months after first sitting on a racehorse The charity race, a five-furlong and 110-yard flat race, was held on the third day of the meet to raise funds for Wellbeing of Women
She said ahead of the race: "It’s crazy to think of my journey over the last couple of months but a big part of my life has been proving people wrong,” she said.
"There are definitely a fair few guys out there who would struggle to do what I am doing and I am thrilled that I am part of shift in social understanding of what women can achieve and what they can be good at.
"There’s quite a stereotype around Muslim girls and them ‘not being able to follow their sporting passions and dreams’.
China International Women’s Match Race
photo Getty Images
Tang Xijing (CHN) and bronze medallist Angelina Melnikova (RUS).
local Dakhla resident stormed to the top of yesterday's women's Kite-Surf single elimination