In 2009, the IPC decided to reinstate athletes with intellectual disabilities in readiness for the 2012 Summer Paralympics in London. Niewiedział's return to major international athletics came when she was selected for the Poland team at the 2011 IPC Athletics World Championships in Christchurch. There she competed in the 1,500 metres race, coming second to Meloch. Niewidzial followed this with a gold medal in the 1,500 metres at the 2012 IPC Athletics European Championships in Stadskanaal before winning her second Paralympic gold in the same event in London.