[1][2] She moved with her missionary Scottish parents to Trinidad at the age of sixteen and then studied in India, becoming exposed to the ideas of theosophy and Katherine Mayo's work on the subjugation of Indian women.
Beginning in the late 1920s, she began contributing to the East Indian Weekly,[4] becoming an activist speaking on behalf of Indo-Trinidadian women on issues like girls' education and child marriage.
[6] She also served as an advisor to Pandit Āyodhyā Prasād when he visited the island and established Arya Samaj in Trinidad and Tobago.
[8] Her journalistic efforts focused on social issues, such as a 1931 piece in the Labor Leader about the involvement of religion in civil marriage and divorce.
[15] Greig along with Gertrude Protain and Louise Rowley of Grenada,[16] May Farquharson[17] and Una Marson of Jamaica,[16] and Audrey Jeffers[13] helped spread feminism throughout the Caribbean.