In the summer of 2017 Stephanie Niemer traveled for a second time in Europe, signing with Greek powerhouse Olympiacos Piraeus,[4] who were competing in the Hellenic Women’s Volleyball League and the CEV Women's Challenge Cup. In Greece, Niemer stood out for her highly efficient service. During a league game against A.O. Markopoulo, she achieved the unbelievable record of 17 serving points.[5]
In 2017-18 season she won with the Piraeus club the CEV Women's Challenge Cup,[6] being the 3rd top scorer with 137 points and the 3rd best server with 19 aces in the whole competition.[7] She also won during the same season the Hellenic championship[8] and the Hellenic cup as well,[9] competing with the best way in the historical Continental Treble of Olympiacos Piraeus that period. In the summer of 2018 she decided to leave Europe and return home for family reasons.[10]