Nikolić received the fifth position on the It's Enough – Restart association's electoral list in the 2014 election.[3] The list did not cross the electoral threshold to win representation in the assembly.
She was promoted to the third position on the association's list in the 2016 election and was elected when the list won sixteen mandates.[4] An opposition deputy, she was a member of the assembly's defence and internal affairs committee, foreign affairs committee, and committee on Kosovo-Metohija; a deputy member of the assembly's judiciary, public administration, and local self-government committee; a member of the European Union–Serbia stabilization and association parliamentary committee; a member of Serbia's delegation to the NATO Parliamentary Assembly; and a member of Serbia's parliamentary friendship groups with Croatia, Macedonia, Spain, the United Kingdom, and the United States of America.[5]
Nikolić left DJB in early November 2018. She initially planned to join a new parliamentary group with other former DJB members, but she ultimately resigned from the assembly on 13 November 2018.[6][7][8]