Vlajnić Jelena was born on November 21, 1988. in Belgrade. She graduated from the Faculty of Law, University of Belgrade in 2011. At the same faculty, she defended her master's thesis "Protection of special rights of indigenous peoples" in 2013. She enrolled in doctoral studies in the field of international law at the Faculty of Law, University of Belgrade in 2013. During her studies, she was a scholarship holder of the Ministry of Education, Science and Technological Development. During her studies, she participated in several domestic and international conferences in the field of international law. She speaks English and German.