I le 2018, na faateleina ai e Stefanidi lana aoina o pine, ma maua ai le tulaga tolu (4.80 m) i le World Indoor Championships i Birmingham, ma le tulaga muamua (4.85 m) i le European Championships i Perelini. Na manumalo o ia i le 2018 Diamond League
faʻasologa (4.87 m) mo le lona tolu tausaga sosoo ma faʻamaeʻaina le vaitau ma le tulaga lua (4.85 m) i tua atu o Anzhelika Sidorova, sui o Europa i le Continental Cup.