Alex Fuggle scored the only goal of the game as Elthorne Park School's U12 lifted the National Kinder+ Girls Sports Cup at Wemley Stadium on Sunday.
The Hanwell-based school, who were representing Brentford FC in the tournament, beat Northfield School, representing Hartlepool United, 1-0 in the showpiece final – held before the Johnstone's Paint Trophy final between Bristol City and Walsall.
The competition, for girls aged 13 and under, saw more than 6,000 girls from across the UK take part, representing each of the 72 Football League clubs.
Goalscorer Fuggle said: “It felt amazing. I’ve always wanted to play at Wembley and score. It’s the best feeling in the whole world.
“The game was tight in parts, but I think we dominated overall. They had some strong players so it was a good battle. My family were all very pleased to see me score.”
The victorious Elthorne girls have been coached by staff at the Brentford FC Community Sports Trust.
Brentford coach Dave Phippard said: “It was unbelievable; the girls were phenomenal out there. From the first whistle they just didn’t stop. Hartlepool had some cracking players, but we sustained great pressure throughout the game.
“It was a happy moment seeing them lift that cup, it’s been a long journey and we’ve won a lot of tournaments to get here, so it’s very special.”
Also in the squad was: Holly Thomson, Kehanna Noel, Demi Heavens, Rhiannon Stewart, Nicole Goolab, Rhianna Allard ad Heba Mahmood.