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.
New Year's fell race to take place in St John's
Runners to tackle Slieau Whallian
Rugby: Hopes for more Manx sides in local competitions in future
Some ongoing challenges facing game heading into 2026
Football: More 'joined-up' approach sought between FA and Manx clubs
FA President admits several challenges ongoing in local game
Tennis: Billy Harris called up to GB United Cup squad
Former Island player heading to Australia this week