http://archives.gnb.ca/Search/VISSE/141B7.aspx?culture=en-CA&guid=AEED0B4A-9C7B-4208-A166-04131642BC4CMarriage of Emma shows a different first name for her mother. Since she was Roman Catholic a spelling variation of Marie a possibility.
The marriage record for Reuben Smith of Red Bank Miramichi, s/o Reuben Smith and Ann Edger on 10 May 1883 was to Theotiste POULIN d/o Xavier Poulin and Angele Thigault (? ) of Caraquet. Solomie Poulin was one of the witnesses.
d. St. Mary's Shippegan (Glouc Co)- 6th inst Reuben Smith of Redbank Southesk (North Co), age 35
from the Oct 20 1883 Chatham Northumberland newspaper "The World"
A death so soon after marriage might be the reason you can't find him.
d. St. James (Charlotte Co) Reuben Smith June 28, 1831 Northumberland county, Chatham, newspaper Teh gleaner and Nurthumberland Schediasma
A different record for marriage of Reuben Smith from the newspaper Union Advocate, June 20, 1883 Newcastle Northumberland
m. at residence of W.S. Brown, Shippegan (Glouc Co) 17 May by REv. J. S. Trudell parish priest Reuben Smith Red Bank (North Co) and Miss Kate Poulin Caraquet.