The Aces Tournament is a prestigious, invite-only event that sees grassroots teams that have won their area leagues compete for a national title.
Lifting the under 12 trophy caps a hugely successful season for Girls United, who play home matches at Nene Park Academy and were only formed 12 months ago.
Head coach Jade Ramm said: “Most of our girls play a year up and we won the Cambs Under 13 League title last season. As soon as the league games finished, we won a tournament at Rugby and bringing home the national title completes a memorable treble.
“At Girls United we believe in providing an environment where players can express themselves and every squad member has excelled this season.”
After a gruelling group stage that included matches against teams from Salford, Sollihull, Coventry, Durham and Hull, Girls United were pitted against Chesterfield in the final.
And after a dramatic match that ended 1-1, the city girls kept their cool to win the subsequent penalty shootout.
Captain, Harper Graham (11), said: ‘Winning the national title is a dream come true. We always work hard for each other so winning the league title and the cups shows that teamwork really is important.”
Girls United are the first Peterborough-based grassroots team to lift an Aces Tournament trophy in over 15 years and have the additional honour of being the first girls team to prosper at the National Finals.