During her time as deputy foreign editor, Mitchell provided extensive coverage of the resignation of Pope Benedict XVI, the State visit by President Michael D. Higgins to the United Kingdom and the 2014 Scottish independence referendum. As London correspondent, she provided extensive coverage of several major terrorist attacks, the Grenfell Tower fire, the 2015 and 2017 general elections, the birth of Princess Charlotte of Cambridge, the Wedding of Prince Harry and Meghan Markle and the Brexit referendum.