[4] Following graduation from Kitchener Collegiate Institute, Millar went on to study at Millsaps College in Jackson, Mississippi.
[4][6] When Preston, along with Galt, Hespeler and Blair, was amalgamated into Cambridge in 1973, Millar was elected the city's first mayor.
[1][2] She opposed the construction of a freeway bypass which would have disrupted parkland in the city, including the Dumfries Conservation Area and the Rare Charitable Reserve.
[6][14][2] Millar died February 10, 2016, of stomach cancer after a brief stay at a Guelph, Ontario hospice.
[3][1][15] In November 2017, University of Waterloo announced the naming of a recently opened residence building as Claudette Millar Hall.