That should read BOWHEY. Mary ann was the eldest daughter of John BOWHEY

Here is the Burial Register see there John died very young in 1862 and Maria lived to be 85. The Eliza there was their youngest daughter she died of fever.
South Australian Register Fri 14 Aug 1868
DICKER-BOWHEY.-On the 13th August, at Archer-street Wesleyan Church. North Adelaide, by the Rev. W. L. Binks, Mr. James Dicker, of Modbury, second son of Mr. John Dicker, farmer, Modbury, to Miss Mary Ann, eldest daughter of
the late John Bowhey, Esq., farmer

A family tree denni for Eliza Adelaide Dicker and her family
It is being added to as info found

If you want to go back a bit further John BOWHEY 1813-1862 was the son of John BOWHAY and Mary ROSEKILLY
and Maria LAPTHORNE 1818-1903 was the daughter of John LAPTHORNE and Mary BOWDEN

roger that :)