In 2016, Webbe was elected to the Labour Party's National Executive Committee (NEC), finishing third in the ballot with 92,377 votes. In 2018, Webbe was shortlisted to become the Labour candidate in the Lewisham East by-election, but finished third in a vote among local party members and was not selected. In July 2018, she was elected as chair of the NEC Disputes Panel. In 2018 Webbe was re-elected to the Labour Party's National Executive Committee finishing second in the ballot with 83,797 votes.