In her late teens, she represented Australia at the 2012 IAAF World Junior Championships in Barcelona, where she progressed to the 400m semi-finals. Two years later in her senior international debut at the Glasgow Commonwealth Games, she was again a semi-finalist in the 400m. She was a key member of the relay team which placed fourth in Glasgow, starting a resurgence of women's 4x400m running in Australia.
In May 2015, she helped the Australian team qualify for the Rio Olympics by placing top-8 at the IAAF World Relays and helped the national team to another quick time at the 2015 IAAF World Championships. Morgan was selected for the 2016 Rio de Janeiro Olympic Games, finishing eighth in the 4x400m relay.