[8][9] At the 2015 general election, Peacock stood as the Labour Party candidate in Halesowen and Rowley Regis, coming second with 36.2% of the vote behind the incumbent Conservative MP James Morris.

[11] Her maiden speech occurred during a Grenfell Tower debate during which she mentioned the local issue of Orgreave.

[14] In November 2018, Peacock, alongside fellow Women's Parliamentary Football teammates, Alison McGovern, Tracey Crouch, Louise Haigh and Hannah Bardell, was rebuked by the then Speaker of the House of Commons, John Bercow, for having a 'kickabout' in the House of Commons after Parliamentary business.

[19] In February 2020, Peacock campaigned to change the maximum sentences for causing death by dangerous driving from fourteen years to life, as well as reforming the Mineworkers' Pension Scheme to get more money for retired miners.

[22][23] In 2013 it was reported that Peacock was in a relationship with Tom Watson, then Deputy Chair of the National Executive Committee.