I Am Trying to Find Where Lydia Nee Davis Trimble Died and is Buried Lydia May Have Died IN Australia

I am hoping to find out what became of Lydia ( nee Davis ) Trimble, Born in 1819 at Donaghmore, Co. Tyrone. Northern Ireland.

Lydia married Robert Delmege Trimble in the 1850s, They were in Australia for about 40 years, where they had 2 children,
Robert returned to Pomeroy, Co. Tyrone, where he was born in 1819, he died and is buried there.
Trimble is my mother's name.

Hoping someone will come up with an answer.

From Robert.