As Shadow Education Secretary, she proposed the creation of a National Education Service modelled on the National Health Service (NHS). She endorsed Rebecca Long-Bailey in the 2020 Labour Party leadership election, who came second to Keir Starmer, and instead successfully stood for the deputy leadership, after which she was appointed as party chair and national campaign coordinator. She was removed from these roles in a reshuffle following Labour's poor performance at the 2021 local elections, subsequently being appointed as Shadow Chancellor of the Duchy of Lancaster and Shadow Secretary of State for the Future of Work.