During this time, she was a participant in the Progressive Party's Academy of Young Leaders program.
[3] Krajnović received the 224th position on the Progressive Party's Aleksandar Vučić – Serbia Is Winning list in the 2016 parliamentary election.
She was given the nineteenth position on the successor Aleksandar Vučić — For Our Children list for the 2020 Serbian parliamentary election.
She is now a member of the assembly's defence and internal affairs committee; a deputy member of the foreign affairs committee and the committee on administrative, budgetary, mandate, and immunity issues; a member of Serbia's delegation to the Inter-Parliamentary Union; the leader of Serbia's parliamentary friendship group with Brazil; and a member of the parliamentary friendship groups with Australia, Croatia, Cuba, Cyprus, Greece, Japan, Jordan, Morocco, Qatar, Spain, Switzerland, Uganda, the United States of America, and Venezuela.
[6] In November 2020, she was appointed to the managing board of Belgrade's City Bureau of Expertise.