I search the IFHF's online database at ROOTSIRELAND.IE. It has abt 19 million B/M/D and other records for MOST Irish counties. Records before 1863 are increasingly sparse and almost non-existant before 1800. Many B/M/D events either weren't recorded, or the records haven't survived.
For Susan Galbraith B 1832 +/- 5 yrs, somewhere in Ireland, with the parents' names unknown, I found 2 records, with 1 in 1834, Co. Donegal.
For a J(ames) Duffy and S(usan) Galbraith marriage in 1852 +/- 5 yrs, somewhere in Ireland, I found 0 records. The lack of a marriage record anywhere casts doubt on the B record's validity.
Suggest you visit the database, register (free), and opt (also free) to be notified as records are added (this is a slim chance).