Have you looked at the census for the Milltown area for 1901 or 1911.
Stripe is in the Addergoole DED and a search on 
www.nationalarchives.ie for 1901 returns the following 4 records:
Gallagher Catherine Stripe North Addergoole Galway 60 F 
Gallagher Peter Stripe North Addergoole Galway 20 M  
Gallagher Micheal Stripe North Addergoole Galway 65 M 
Gallagher Bridget Stripe North Addergoole Galway 22 F .
and in 1911, a search yields:
Gallagher Catherine Stripe, North Addergoole Galway 35 F Co Galway  
Gallagher Catherine Stripe, North Addergoole Galway 77 F Co Galway 
Gallagher Peter Stripe, North Addergoole Galway 36 M Co Galway 
Gallagher Ellen Stripe, North Addergoole Galway 1 F Co Galway  
Gallagher Mary Kate Stripe, North Addergoole Galway 2 F Co Galway  
The important thing to note if you decide to search church records etc is that the Milltown area is under ADDERGOOLE + LISKEEVY parish around the period you're interested in.
Any idea which graveyard in Milltown - Kilgevrin, Kilclooney..... and there might be a third graveyard in the parish....someone else might help out here.
Best of luck