[8] She started without previous knowledge with wheelchair tennis at the age of 24.

In 2007, she played in the B squad and in 2010 was taken into the A-squad of the Austrian national wheelchair tennis team.

Koósz won the 2009 national championship in women's doubles with her partner Anette Baldauf for the first time, and a year later she became national champion in women's singles.

After London, Koósz hung up her tennis racket for health reasons.

In 2016, she discovered badminton and started a new career as an international parabadminton player and army athlete.