Gymns became the final team to qualify for the Warehouse Fitness Floodlit Cup semi-finals on Sunday.
A goal in each half from Kayleigh Whitehead booked their place at the expense of Colby in a 2-1 win.
The southerners, who only needed a draw to qualify, replied through debutant Sarah Wignall.
FC Isle of Man hoping to keep up good run against Abbey Hey
Ravens three unbeaten ahead of latest meeting at The Bowl
Hockey: Ladies Premier League top two to lock horns
Castletown A and Valkyrs A on course for big meeting in latest hockey ties
Rugby: Huge game for Douglas at Vale of Lune
Big Manx derby elsewhere at Ballafletcher this weekend
Football: Huge Division 2 southern derby awaits this weekend
Corinthians with chance to extend premier league lead