They defeated Louth last weekend to get there.
A brace from Ciara Blundell and a Leona Archibald penalty proved enough to see Westmeath into the All-Ireland Intermediate semi-finals.
They emerged top of their group following a 3-11 to 1-5 victory over Louth yesterday.
It followed a nine goal performance against Longford in their opening game and sets up a clash with Roscommon in two weeks time.
Roscommon themselves had convincing wins over Wexford and Offaly to reach the knockout stages and will provide the Lake County with their stiffest test to date.
A 5-10 to 4-4 win over Offaly yesterday condemning the Faithful ladies to a winless championship year following defeat to Wexford two weeks ago.
Laois were unlucky not to join their neighbours in the semi-finals.
They defeated Kildare at the weekend to win their third group game, but lost out on score difference to table toppers Clare, who defeated the O'Moore County last weekend.
Ultimately it was the banner's demolition of Sligo (7-18 to 0-2) yesterday which got them over the line.
Laois could only manage a 5-8 to 1-5 win over the weakest team in group 4 but it has been a very positive showing for Donie Brennan's team who will look to build on this and make the knockouts next season.
Alex Dunne Boosts F2 Title Hopes With Azerbaijan Feature Race Victory
Anna McGann Named To Start For Ireland Against Japan
Ronan Deegan Set To Make Cage Warriors Debut
Laois SFC: Four Teams Battling To Reach Final
Ireland Prepare For Nations League Clash Against Israel Amid Controversy
Westmeath SFC: Four Teams Aiming To Reach Decider
Athlone Town Pursuing Back To Back Women's FAI Cup Wins
Alex Dunne Secures Pole For Formula 2 Feature Race In Azerbaijan
Athlone Town Continue Push For Play-Off Spot
Offaly SFC: Four Teams Battle It Out For Final Place
Semi-Final Weekend In Offaly Senior Camogie Championship
Offaly Boxer Competing For Irish Super Bantamweight Title This Weekend
Almost €200k Raised For Offaly Teen Injured In Serious Road Crash
Laois SHC: The Harps Book First Semi-Final In 14 Years
Cliodhna O'Connor Named Westmeath Ladies Football Manager
Offaly SHC: Belmont Relishing Semi-Final Encounter
Westmeath SHC: Raharney To Turn Focus To Upcoming Semi-Final
Offaly Pick Up Two All Star Hurling Nominations
I Want To Play Football Again - Lily Agg
Laois SHC: Rosenallis Make First Semi-Final In Six Years