Kammala jumla mai zuwa: A cikin 2018, Stefanidi ya haɓaka tarin lambobin yabo, yana ɗaukar matsayi na uku (mita 4.80) a Gasar Cin Kofin Duniya a Birmingham, da matsayi na farko (mita 4.85) a Gasar Turai a Berlin. Ta lashe gasar
2018 Diamond League jerin (4.87 m) a shekara ta uku a jere kuma ya kammala kakar wasa tare da matsayi na biyu (4.85 m) a bayan Anzhelika Sidorova, wanda ke wakiltar Turai a gasar cin kofin nahiyar.