It appears that Mary also signed Sheet 116 of the suffrage petition.
Biography contributed by Katherine Blakeley:
Mary Beattie McLaren was born about 1866 – the eldest daughter of James Fenton McLaren, a tailor.
When she signed the suffrage petition Mary was living with her family at Tay St, Kensington, Dunedin, working as a dressmaker.
Mary married Henry Albert Barnes, a letterpress machinist on 14 August 1900, at Auburn, New South Wales, Australia. They came to live in New Zealand and had four children.
Mary died on 25 December 1933 and Henry died in 1938. They are buried together in the Bromley Cemetery in Christchurch.
Sources
BDM online NZ https://bdmhistoricalrecords.dia.govt.nz/
Family Search https://www.familysearch.org
Otago Nominal Index http://marvin.otago.ac.nz
Papers Past https://paperspast.natlib.govt.nz
Christchurch City Council http://heritage.christchurchcitylibraries.com