The victory comes exactly a week after the school's Year Six boys were crowned Barnet west champions.
Rosh Pinah girls came away from the tournament with a 100 per cent record - winning every group game to progress to the semi-finals.
The came from 2-1 down to win 4-2 and set up a final showdown against Goldbeaters School.
And a solitary goal was enough for Rosh Pinah to lift the trophy after a hard-fought final match and see the Edgware school progress to the tournament of champions from Barnet.
Rosh Pinah PE co-ordinator Mr Goldin commented: "The girls have been on a journey throughout their time at Rosh Pinah, progressing and getting better each year.
"This victory shows how dedication and hard work truly pays off. After our victory last week by the boys in their tournament and the girls now winning in their tournament, we are showing what a fantastic school Rosh Pinah is and what a sporting force we are in the borough."
ROSH PINAH: Sasha Cudner, Gemma Peters, Grace Shapiro, Jessica Hyams, Hayley Klein, Gemma Baron, Talia Rosen