[3] She has a first class honours BA in politics and Spanish from the University of Central Lancashire (2012), after studying as a mature student.

[3][4] Collinge has been a member of Lancashire County Council, representing Lancaster East for Labour, since 2016.

[6] Collinge was selected in September 2023 as the Labour candidate for Morecambe and Lunesdale for the next general election.

[1] She made her maiden speech on 22 July 2024, paying tribute to the previous MPs for the three seats making up the new constituency (David Morris, Tim Farron and Cat Smith), and to Geraldine Smith who had held Morecambe and Lunesdale from 1997 to 2010, and to the 50:50 Parliament campaign and the Labour Women's Network for their work to see more women elected.

[10] In November 2024, Collinge voted in favour of the Terminally Ill Adults (End of Life) Bill, which proposes to legalise assisted suicide.