Am I .... is the family I listed with the spelling TYNDAL your family? Afterall, the same Reverend baptised Charlotte in 1820, but by 1830 without his registry at hand, has her year of birth as 1821, and she was placed in the orphanage. So, perhaps it was that Charlotte born 1820 who married in 1839 .... and Rev FULTON simply recorded her MOTHER's ship of arrival....
There's a marriage 3 Jan 1848 for a Charlotte TINDALL, and John STEWART, Sydney NSW....
https://familysearch.org/ark:/61903/1:1:XTZ3-6MCThere's many lasses named Charlotte with surname as variation of TYNDAL in NSW in the decades before the gold rushes....
Re lack of death registration. Civil registration commenced 1 March 1856. Initially it was the responsibility of the head of the household to report the death to the police, who could then determine if it was a sudden death, needing an inquest or at least an enquiry.... If there was an inquest/enquiry, and it was not in Sydney CBD where many people lived (and therefore died so the system of registration was frequently in use) , then the police would issue an interim order permitting the burial. Consequently many 'rural' (including of course Castlereagh, Evan, and even Parramatta, Liverpool etc) districts did not receive the rest of the paperwork for the registration to proceed. The administrative system was eventually sorted, but not before WWI when it became driven by pre-printed forms, and funeral directors became responsible for the documentation....
ADD
By recording the bride's age as 21, the Rev would not have needed to ask the bride to find a parent to give consent, as at age 21 the bride was old enough to give her own consent to her own marriage. It actually suggests to me that the bride's mum was no longer in the district .... perhaps deceased. Do you have info on the youngest of John's children listed in the petition that put Charlotte in the Orphanage.... (Born 1824, so by 1839 he could well have 'left home' and be making his own way in life....
Cheers, JM
