They were three points down entering the last ten minutes.
Shanahoe will return to the senior ladies ranks in Laois.
They claimed the Intermediate title with a hard fought one point victory over Park/Ratheniska last night, 1-9 to 1-8.
A first half goal from Aoife Finlay and five frees from the boot of Mary Griffen, including with the last kick of the contest, led Shanahoe back from a three point deficit in the closing stages.
Park/Ratheniksa will rue two late yellow cards, which gave their opposition the momentum for the comeback.
Earlier this week, Graiguecullen took home the Junior title, defeating Ballyfin by 7 points, 2-13 to 2-6.
Graiguecullen were led by 1-6 from corner forward Kelly O'Neill against a gallant Ballyfin side who had goals from Rachel Walsh and Edel Finn and five points from Chloe Scanlon that ultimately wasn't enough to keep pace with the winners.
Laois SFC: Killeshin Deliver Knockout Blow To Portlaoise
Westmeath SFC: Moate All Whites Turn Attention To County "Standard Bearers"
Town Continue Rich Vein Of Form With Creditable Students Draw
Offaly SFC: Shamrocks And Tullamore Secure Semi-Final Spots
John Heslin Aiming To Feature For Westmeath Next Season
Westmeath SFC: St Loman's Mullingar And Moate All Whites Progress
Athlone Town Move Closer To Women's Premier Division Title
Alex Dunne Keeps F2 Title Hopes Alive With Spanish GP Podium
I've Great People Around Me - Shane Lowry
Trump To Lift US Tariff On Irish Whiskey After Talks With Shane Lowry
Lowry Breaks Title Drought With Magnificent Irish Open Victory
Shane Lowry Leading The Way At The Irish Open
Alex Dunne Secures Front Row Start For F2 Feature Race In Madrid
Former Golf Coach Stunned With Stuart Grehan Not Competing At Irish Open
Treaty United The Next Test For Athlone Town
Mark McHugh To Remain In Charge Of Westmeath Footballers
Cannonball 2026 Heading For Offaly Today
Westmeath SFC: St Loman's Mullingar Aiming To Push Forward
Laois SFC: Places In The Semi-Finals Up For Grabs