I have had a communication to imply that my great grandmother was indeed Mary Graney.
The name Gurney appears on two documents, Intention to Marry and Marriage.
In these documents, Mary was pretending to be three years older than she was!
We have no earlier record of her at this point. But after she married in he same year she arrived in New Zealand
Her maiden name is always shown as Graney. There is one reference to say she emigrated from London area.
Gurney is a far more common name than Graney. I think it all makes sense.
Investigations are ongoing. Note she had 13 children with John Clements Burrell
George Burrell
Auckland
New Zealand