Jenny O'Hara Pincock was born in Madoc, Hastings County, Ontario on April 13, 1891. Her great-grandfather had been a settler in the area. Pincock studied music at the Ontario Ladies' College in Whitby, Ontario (ca. 1908) and at the Royal Conservatory of Music in Toronto (ca. 1912). On June 15, 1915 she married osteopath Robert Newton Pincock (1883-1928) and moved with him to St. Catharines where he maintained a practice.

In 1927, along with her sister Minnie and brother-in-law Rev. Fred J.T. Maines, who was minister of the Church of Divine Revelation in St. Catharine's, Pincock began to organize seances with Mr. William Cartheuser, an American medium. She was often responsible for taking notes. In 1935 Jenny Pincock ceased connection with Cartheuser and with the Church of Divine Revelation. Two years later she moved from St. Catharines to Kitchener, Ontario. In 1942 she purchased and moved to property formerly owned by her grandfather near Madoc. Pincock died on July 13, 1948 in Kitchener.

A book of verse by Jenny Pincock titled Hidden Springs was published posthumously (Privately printed, 1950) with an introduction by E.J. Pratt.