A world champion in the women's four, she was part of the Dutch quadruple sculls that won silver at the 2016 Olympics and competed in the double sculls at the 2012 Summer Olympics.

[4] At the 2013 European Championships, Janssen won bronze in the women's single sculls, while at the 2014 European Championships, she won the bronze in the women's double sculls with Nicole Beukers.

[7][8] At the 2016 Olympics, Janssen, Chantal Achterberg, Nicole Beukers and Carline Bouw won silver in the women's quadruple sculls.

[9] She won the women's quadruple sculls at the 2017 World Championship with Olivia van Rooijen, Sophie Souwer and Nicole Beukers.

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