Thanks for your questioning.
A further obituary was placed in 'The Sydney Morning Herald Friday 23 Oct 1874':
"O'Brien - Oct 22 at her residence, Gloucester-terrace, Macquarie Street South, Jane, the beloved wife of John O'Brien coach trimmer, aged 38 years in childbed leaving an affectionate husband and seven children to mourn their loss".
Although this doesn't identify the children by name, I have firmly identified 6 through a range of records, not so sure about young Jane (1862-) though.
Find a Grave has a photo of the headstone which records Jane (mother who died 1874), her mother also called Jane and her father called Charles Trumper, Emily Low, James and Emma Low (I think the Low family is part of the Trumper family), Alice O'Brien. John is also recorded here. Unfortunately, the headstone is very hard to read in the photo.
Rockwood General Cemetery: Old Anglican Section A Plots 148-150 in S.A.G.
Frances, Annie Ada and Emily Harriet are buried at Woronora. Ellen is buried at Waverly Sect 6 Row 1.
Their sister Jane (1862-) is elusive in baptism, marriage and death!
Thanks again