Eittie appears to have signed multiple times, on sheet 60 under her full name (Margaretta) and again on sheet 141.
Biography contributed by Katherine Blakeley
Margaretta (Etta) Black Coupar was born in New Zealand in 1872 – the daughter of James Coupar, an aerated water and cordial manufacturer, and Mary Ann Atkinson.
Her family lived in Waikouaiti later shifting to Dunedin in about 1890.
On 22 January 1896 Margaretta married Robert Drysdale Jack at the St Luke’s Presbyterian Church, Sydney, Australia. They settled in New Zealand and had three children.
Robert Jack died suddenly while playing cricket in 1923, and Margaretta Jack died on 30 July 1957. They are buried together in the Port Chalmers cemetery.
Margaretta was a strong supporter of the suffrage petition, signing it three times.
Sources
BDM online NZ https://bdmhistoricalrecords.dia.govt.nz/
DCC Cemetery Records http://www.dunedin.govt.nz/facilities/cemeteries/cemeteries-search
Family Search https://www.familysearch.org
Otago Nominal Index http://marvin.otago.ac.nz
Papers Past https://paperspast.natlib.govt.nz