Much to my surprise, her name has been misspelt as 'MORBEY'.
The Sydney Morning Herald, Tuesday 6 January 1880
The FRIENDS of Mrs Ann MAWBEY are respectfully invited to attend the funeral of her late beloved DAUGHTER, Grace, to move from her residence, Albermarle street, Kingston. THIS (Tuesday) AFTERNOON at 3 o'clock, for Balmain cemetery. CHARLES BOOTS, Undertaker, Hordern street, Newtown.
There is also a James 'MAWBEY' on the list, buried in 1871.
He was Grace's older brother, baptised at Dural, where the family was living then, in 1851.
Like his sister, he too died young at the age of 19.
The Sydney Morning Herald, Wednesday 6 September 1871
MAWBEY—August 4, at the residence of his mother, O'Connell-street, Newtown, James, fifth son of the late George Mawbey, aged 19 years.
The father of James and Grace, George Mawbey, died of apoplexy (stroke) in on 30 November 1862 at the age of 53.
He was buried in Camperdown Cemetery at what is today the inner city suburb of Newtown, Sydney.
I will go and have a look at the actual burials register at Leichhardt Municipal Library after the holiday period.
Balmain Cemetery was located in what is today the inner Sydney suburb Leichhardt.
However, the municipality would have been Balmain.
Today Balmain is another inner city suburb situated on a headland inside Sydney Harbour.
Balmain Cemetery was on the corner of Norton and William Streets, Leichhardt, and is now a public park.
Today I discovered that my local library has microfiche for the Record of Internments at Balmain Cemetery.
The information I obtained from them will save me a trip to Leichhardt Library.
James was interred first, on 5 August 1871, in a 'selected grave', 3 x 7, No. 1530, undertaker Mr H Mitchell.
There is a number written in the 'remarks' column, cross-referencing to the grave of Grace who died nine years later in 1880.
Her grave, No. 5140, bore the same details as her brother's.