Valley claimed the title with a one-wicket win as their lower order fought bravely to get across the line after University of Queensland had appeared to be on track to successfully defend their total.
Townsville product Sianna Ginger was awarded the Julia Price Medal for player of the final with her all-round effort of 25 from 55 balls and 2-19 from 10 overs.
University of Queensland made 9-128, with Emma Jackson (27) and Gillian Chalmers (25) working hard with the bat against a disciplined Valley attack led by Queensland Fire and WBBL Heat pace bowler Georgia Prestwidge (3-20) and Ginger, named last week in the Queensland Under-19 team to head to the national titles in Adelaide next month.
Valley were on the back foot initiially in their chase, battling to 7-88, with Warwick schoolgirl Laura Schiewe taking vital wickets with her left-arm wrist spin on the way to figures of 3-24.
But the lower order pairing of Eleanor Swanepoel and Jordan Spilsbury held their nerve to get Valley to 9-129 with four balls remaining.
Jodie Fields Shield pace-setters South Brisbane took out their Second Grade final as well with a match-winning turn by leg-spinner Melissa Lewis, who nabbed 4-11, as Souths overcame University of Queensland in the decider.
Lewis later joined in a first for the KFC Queensland Premier Cricket competition, as Holly Ferling and Kirby Short led an all-female Kayo Freebies broadcast that featured Katherine ‘Farmer’ Raymont, Georgia Voll, Meagan Dixon, Lewis and Tess Cooper in commentary.