She was born as Mary Victoria Cracroft Wilson at Culverden in 1897. Her parents were John Wilson, a sheepfarmer, and Mildred Hall. Her paternal grandfather was John Cracroft Wilson, and her maternal grandfather was John Hall; both had been prominent MPs. Her mother was known for her involvement with public activities, particularly those involving women.
Mary was educated for eight years at the Brondesbury School in London, where she became a head girl. During the First World War she served in the nursing division of the VAD (Voluntary Aid Division).
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In 1941 Grigg was elected onto the Ashburton Hospital Board and became its first woman member. She was also president of the Ashburton Plunket Society, a member of the Red Cross executive and President of the Mount Somers Ladies' Guild. When her husband Arthur Grigg rejoined the army, she took over his parliamentary duties in the electorate.
She was elected to represent the Mid-Canterbury electorate in Parliament from 1942 after the death (on 29 November 1941) of her husband Arthur Grigg in a political practice known as widow's succession. She had married Grigg in 1920, and he had held the Mid-Canterbury electorate from 1938
Her greatest area of concern was farming issues, followed by housing, health and education. In 1942 she joined with other women MPs from both sides of the House to argue that the number of women police officers should be increased and that they should be issued with a uniform. She also campaigned for women to be permitted to sit on juries.
She married William Polson MP on 29 June 1943 and did not seek re-election in the September 1943 general election.
Grigg continued to be active in the National Party after her parliamentary career ended. She supported Hilda Ross in her first election campaign in 1945, and in 1949 Ross and Grigg co-wrote the National Party's election manifesto.
Lady Polson was the President of Victoria League Canterbury from 1965 to 1970.
- Garner, Jean. "Grigg, Mary Victoria Cracroft". Dictionary of New Zealand Biography. Ministry for Culture and Heritage. Retrieved 8 November 2013.
- Macdonald, Charlotte (ed.) (1991). The Book of New Zealand Women. Wellington, New Zealand: Bridget Williams Books. pp. 526–527. ISBN 0908912048.
- "No. 37410". The London Gazette (Supplement). 28 December 1945. p. 162.
- "No. 39245". The London Gazette (Supplement). 1 June 1951. p. 3099.
- Gustafson, Barry (1986). The First 50 Years : A History of the New Zealand National Party. Auckland: Reed Methuen. ISBN 0-474-00177-6.
- Wilson, James Oakley (1985) [First published in 1913]. New Zealand Parliamentary Record, 1840–1984 (4th ed.). Wellington: V.R. Ward, Govt. Printer. OCLC 154283103.
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|Member of Parliament for Mid-Canterbury