Seitz has also had success in the individual all-around event, where she is the 2011 European silver medalist and an eight-time German national champion (2010–13, 2015, 2017–18, 2021).

Seitz competed at the 2010 World Artistic Gymnastics Championships, alongside Oksana Chusovitina, Lisa Katharina Hill, Joeline Mobius, Pia Tolle, and Giulia Hindermann.

Seitz competed at the 2015 São Paulo World Cup in May where she won bronze on uneven bars behind Shang Chunsong of China and compatriot Sophie Scheder and silver on floor exercise behind Flávia Saraiva of Brazil.

[17] In September Seitz competed at the German National Championships where she won gold in the all-around, finishing ahead of Pauline Schäfer and Sophie Scheder.

Additionally she won gold on uneven bars, silver on balance beam behind Schäfer, and placed fourth on floor exercise.

[19] In October Seitz competed at the World Championships alongside Griesser, Lisa Katharina Hill, Schäfer, Scheder, and Pauline Tratz.

[26] Seitz was selected as one of the representatives of the German national team in 2016 Summer Olympics together with Kim Bui, Tabea Alt, Pauline Schäfer and Scheder.

[28] In June Seitz competed at the German National Championships where she won gold in the all-around, on uneven bars, and on balance beam.

During the team final she contributed scores on vault, uneven bars, and floor exercise towards Germany's eighth-place finish.

During the uneven bars final Seitz won the bronze medal behind Nina Derwael of Belgium and Simone Biles of the United States.

[37] Afterwards Seitz competed at the Swiss Cup, a unique mixed pairs event where she was partnered with Marcel Nguyen and together they won gold.

[38] In March Seitz competed at the Stuttgart World Cup where she won bronze behind Simone Biles of the United States and Ana Padurariu of Canada.

[39] In August she competed at the German Championships where she placed fifth in the all-around, first on uneven bars, and second on floor exercise behind Kim Bui.

[40] In September Seitz was named to the team to compete at the 2019 World Championships in Stuttgart alongside Kim Bui, Emelie Petz, Sarah Voss, and Sophie Scheder.

Together they finished fourth behind the United States (Jade Carey and Allan Bower), Ukraine (Diana Varinska and Oleg Verniaiev), and Switzerland (Giulia Steingruber and Oliver Hegi).

During the all-around final, in which she placed fifth, Seitz and compatriot Kim Bui wore unitards opposed to the standard leotard that is common in women's artistic gymnastics.

[51] In June, Seitz competed at the German Championships, where she took the silver medal in the uneven bars final behind Kim Bui.

[52] In August, Seitz competed at the European Championships in Munich, where she helped Germany qualify to the team final in fourth place.

[54] In the uneven bars final, Seitz won the gold medal ahead of Alice D'Amato and Lorette Charpy with a score of 14.433.

[53] Seitz competed at the DTB Pokal Mixed Cup, where she helped the German team take the silver medal behind Japan.

[55] She next competed at the European Championships, where she took the bronze medal in the uneven bars final behind Alice D'Amato and Becky Downie.