Mack scored 113 not out from just 125 balls to lead the ACT to an innings total of 6-285. Dane van Niekerk was also instrumental, hitting 61 runs from just 57 balls to notch up her second half century of the season.
Skipper Erin Osborne won the toss and elected to bat which worked well for the side in their 30 run win over the Victorian Spirit on Friday at Manuka Oval.
Mack and Hayley Jensen put on a 52 run opening partnership before Jensen was run out by Queensland wicket keeper Beth Mooney for 16. Osborne was the Fire's second scalp of the morning, with Mooney once again in the mix taking a strong catch and giving Holly Ferling her first wicket.
Van Niekerk was next out to the crease and put on a quick half century to combine with Mack for a 110 run partnership and setup a daunting total for Queensland to chase.
The Meteors started their defence on their terms, with Marizanne Kapp bowling a maiden over before Sam Bates got the wicket of Beth Mooney in just the second over.
Despite a strong performance from Delissa Kimmance (61 from 63), the ability of Bates and Kapp to restrict the Fires run rate proved too much.
New to the Meteors side this year, Hayley Jensen was very impressive with the ball finishing the afternoon with 5-32 after her 8.3 overs.
Wickets from van Niekerk (2-47), Bates (2-15) and Kapp 1-31 also helped bowl out Queensland for 219 and give the ACT a bonus point and sitting in second place on the WNCL ladder behind the NSW Breakers.
Katie Mack was named player of the match.
The Meteors next match is against the NSW Breakers on November 28 at Murdoch University, Perth.