Australia, Marriage Index,
Name: Elizabeth J Agnew
Spouse Name: Thomas Watt
Marriage Date: 1847
Marriage Place: New South Wales
Registration Place: Sydney, New South Wales
Registration Year: 1847
Volume Number: V


Australia, Death Index
Name: Elizabeth J Watt
Death Date: 1893
Death Place: New South Wales
Registration Year: 1893
Registration Place: Walcha, New South Wales
Registration Number: 14486

There are no parents listed for Elizabeth on death reg

Not sure of Elizabeth's birth year but is might or might not be her. Do you know her age at marriage or death ??

New South Wales, Australia, Assisted Immigrant Passenger Lists
Name: Eliza Agnew
Birth Year: abt 1827
Age: 17
Gender: Female
Arrival Date: 20 Jan 1844
Vessel Name: Elizabeth

Listed as house servant, from Tyrone

Also Isabella age 15 house maid , from Tyrone (sister ??)

Maybe a son of Elizabeth and Thomas

Andrew Watt
Died: 1862
Father: Thomas
Mother: Elizabeth J.
Registration Place: Arimidale, N.S.W
reg#2308

ACCIDENTAL DEATH -On Monday last Mr L Markham, district coroner, held an inquest on the body of Andrew Watt, aged 10 years, at the residence of Mr. Thomas Watt, father of deceased on the Armidale Creek. It appeared, from the evidence, that the deceased, accompanied by a brother and a sister younger than himself, had gone to a tree in which there was a bird's nest, about half a mile from his parents' house, and that he climbed up to the nest, in attempting to come down, however, he fell, and was so severely injured as to remain unconscious. Doctors Spasshatt and West attended, and after a consultation they agreed there was no hope of recovery Deceased died soon after 11 on tho night of the day when he was injured.
The jury returned a verdict that deceased had been accidentally killed by falling from a tree (Deceased was the same boy who a short time ago was providentially rescued when lost in the bush, and on the point of entering the rough country at the Falls, where, in all probability, he must have perished.)
The Maitland Mercury and Hunter River General Advertiser 11th November 1862 p.3

Elizabeth Agnew was born approx 1827 in Armagh Ireland, married 1847 Sydney Scots Church. She was 20 years old when married and states 49 years in NSW on her death cert. Saying goes her father died young and she was unable to read or write. She died Walcha 1893 and parents stated as unknown. Buried at Big Hill Walcha. Her occupation on her marriage cert was domestic, and there is no mention of her husband on her death certificate. There is no info regarding Thomas's death. he is not buried in Walcha and there is no police records. Alexander Smail and Mrs Violet Smail of Sydney were witnesses on their marriage cert, but they are not related. Alexander was used a lot to witness marriages at that time.
Andrew Watt on birth cert parents are Thomas and Jane. Jane was Elizabeth's second name. A story of a little boy lost in the woods rings some memories with older relatives. And the age fits in well into the family.
The immigration details looks very possible as well.