She competed at a friendly competition in Länderkampf Kunstturnen where she helped Germany finish first as a team ahead of Romania and Switzerland.

Grießer began the season competing at the São Paulo World Cup where she won bronze on floor exercise behind Flávia Saraiva and Elisabeth Seitz.

[5] In September she competed at the German National Championships where she placed fourth in the all-around, on uneven bars, and on balance beam.

[13] In November Grießer competed at the Swiss Cup where she was paired with Lukas Dauser; they finished in seventh place.

[14] She ended the season competing at the Cottbus World Cup where she qualified to the uneven bars, balance beam, and floor exercise finals.

[15] In June Grießer competed at the German National Championships where she placed sixth in the all-around and on floor exercise and won bronze on the uneven bars.

She was named to the team alongside Kim Bui, Sarah Voss, Pauline Schäfer, and Emma Höfele.

[22] Later that month she competed at the German National Championships and finished seventh in the all-around, fourth on balance beam, and first on floor exercise.

[23] Grießer was later selected to represent Germany at the 2018 World Championships alongside Elisabeth Seitz, Bui, Scheder, and Voss.

[28] In August she competed at the German National Championships where she placed seventh in the all-around, sixth on balance beam, and third on floor exercise.