Well after a very long day of hunting, I think I have found Mary's baptism.
The only thing is that she was baptised in 1848! That is, if her parents really were Catherine Hogan and John Ryan.
This would have made her only 12yo when she married Patrick! If it is our great grandmother, we have found her some siblings as well
John Ryan and Catherine Hogan married 2/2/1833, Cashel and Emly, Tipperary. (Present:) Patrick RYAN and Honora Walsh.
Children:
1. Edmund: baptised 27/7/1834, Cashel and Emly, County Tipperary. Sponsors: Edmund TRIGGS & Mary RYAN.
2. Patrick: baptised 27/3/1836, Cashel and Emly, County Tipperary. Sponsors: James RYAN and Catherine MAHONEY
3. Thomas: baptised 23/2/1839, Cashel and Emly, County Tipperary. Sponsors: James and Eliza KELLY
4. Margaret: baptised 2/5/1842, Cashel and Emly, County Tipperary. Sponsors: Matthew Healy and Mary CRONIN
5. Daniel: baptised 4/8/1844, Cashel and Emly, County Tipperary. Sponsors: John CRANLEY and Mary EDDGE
6. MARY: baptised 26/3/1848, Cashel and Emly, County Tipperary. Sponsors: Patt RYAN and Margaret Magrath.
Generally I have found that in Ireland, RC children were baptised relatively soon after their birth.
There is a bit of a space between Daniel and Mary... but not huge, particularly given Mary was child #6.
=> Should I keep her birth as c1841 - which all the docs in Australia would indicate, and which makes her about 19yo when she married
Such an incredibly satisfying feeling finding the family after 13 straight hours of hunting on FindMyPast, Ancestry, RootsIRE, FamilySearch etc. Definitely not easy in Ireland!
PS. The fact that there was no Mary O'Donnell travelling with Patrick and the children, but a Mary Dwyer 22yo, together with the fact that Mary Ryan with parents John Ryan and Mary Hogan married only 12 years after she was baptised, has me feeling very unsure. Something fishy somewhere?
Or not our Patrick O'Donnell on the Donald Mackay?
Hmmm