Hoping someone can help solve a mystery for me.

I am trying to find the birth of an Elizabeth Ann Overend.
Born circa 1869/70.
Parents: Robert Overend/Overand and Sarah Cuttriss/Cuttris/Cuttress
Robert Overend and Sarah Cuttris were married in Hay, NSW , 8th Jan 1869.
Their second child, John Thomas Overend was born on the 9th March 1872 at Balranald, NSW
3rd child Edward ernest Overend 1875, at Echuca, Vic
The rest were all born at Geelong Victoria.
I have searched under the name Overend and Cuttris (and the variations) but have had no luck, perhaps can't see for looking

After Roberts wife, Sarah, died, Robert married her sister Elizabeth Cuttris.
Would appreciate any help in finding the birth of Elizabeth Ann Overend please

Also I have had trouble finding shipping for Robert Overend to Australia, he was born in 1842, Sutton, Yorkshire.
regards
Margaret