Gymns booked their place in the MBL Floodlit Cup but only after being given a scare by Peel on Sunday.
Goals from Mia Brigantova, Alannah Hall and Eleanor Gawne saw them through after the westerners had led 2-1 at the Bowl.
Their markswomen were Katie Meads and Ellan Cleator.
Corinthians, who had already qualified for the last four, finished as group winners with a 4-0 win over a resolute Rushen, courtesy of goals from Charlotte Wynne-Smythe, Sarah O’Reilly, Shannon Groves and Stephanie Hall.
Cycling: Bostock nominated for national champion of the year
Manxman one of six riders on British Cycling shortlist
Football: Railway Cup hopefuls all maintain pace in premier league
Castletown stay four points clear atop Division 2
Rugby: Vagabonds Ladies stay top with another victory
Vagabonds men and Douglas also take respective wins on home soil
Hockey: Harlequins A beat rivals to close in on prem leaders
Bacchas B take important victory in battle for top-flight safety