On 8 August 2013, at the Sir Chris Hoy Velodrome in Glasgow, Nelson competed at the UCI Juniors Track World Championships. She was part of Britain's Team Pursuit squad which also included Hayley Jones, Amy Hill and Emily Kay. In the qualifying heat, they broke the "senior" world record which had only been set a few weeks previously at the European Track Championships, setting a new time of 4:38.708. In the final, they broke the record once more, with a time of 4:35.085, beating Russia to become world champions.