White was born in 1964 in Stamford, Lincolnshire.[1] She has an identical twin, Deb Davies, who was elected as a Labour councillor in Newport, Wales in 2012.[2]
White was office manager for her husband John Mann, the Bassetlaw MP from 2003 to 2019.[4] She served as chair of the Bassetlaw Constituency Labour Party.[5] She was a member of Unite the Union's executive for over a decade.[6]
White was first elected as a Member of Bassetlaw District Council for Worksop East in 2012.[7] She was appointed as the executive member for regeneration in 2013 and became Deputy Leader in 2015.
White married John Mann in 1986, with whom she has three children.[10][11] A former Labour member was convicted for harassment against White, including mailing her a dead bird.[12][13]