Your grandmother's name is Marie-Sophronie (Minnie as a nickname) like her aunt.Your grandmother's dob is 10/31/1888 in Laconia, Belknap Cty., NH.
Her godparents at her baptism at St-Joseph's Church, Laconia, on 1 Nov 1888, were:Etienne Valliere and Sophronie Valliere, all according to the Repertoire of Baptisms at St-Joseph's Church.
My great-aunt Sophronie Valliere who married my great-uncle, her first cousin, Joseph-Pierre Lamothe (my grandmother's brother)was also called Minnie, and it must be she who was your grandmother's godmother, and Etienne would more than likely have been the brother of MY Sophronie.
I'll see what I can find on the marriage date of your grandparents next time I go to the library in Manchester, NH.
In the meantime, I hope this helps you a bit, Linnie