Following on with the Brewarrina link I read somewhere that the Brewarrina Information Centre had burial records so I rang them.
Catherine Curran is most certainly buried in the cemetery there and died on 25th April, 1915 (the day of the landing at Anzac Cove!). She was buried on the 27th. The only extra info they had on the burial records was that she was catholic and 44 years old. However, they did state that her actual death certificate would probably provide more information than the burial record.
Her age, although not exact, would suggest it quite possible that she's the Catherine Curran born at Maitland.
The info centre also gave me the name of their local historian so I will try to contact her and see what we might be able to discover.
Cheers,
Tim L.