Who was Seagreet Elizabeth Berg B 1877 IN Greytown New Zealand

Seagreet Elizabeth Berg was born in Greytown, Wairarapa, New Zealand in 1877 - she died in Pahiatua in 1955 and is buried in Mangatainoka Cemetery.
She married Roland Henry Russell in 1905 - he was born in 1883 in Taita, New Zealand son of Robert Russell, second husband of Esher Daysh - Ester's first husband was David Mabeyb who died in 1878

I would like to know more about Seagreet - her parents, where they were from and any siblings and how she got that name