In the final of the women's -70kg category, Slaček faced the French competitor Lucie Rullier, who threw Slaček for an ippon with an ashi-guruma after a little more than two minutes of the match.
The medal won by Slaček is the first for Croatia at the World Cadet Championships since 2019, when Ana Viktorija Puljiz won silver in the -48kg category and Katarina Krišto won bronze in the -63kg category.
A total of 403 judokas from 48 countries are competing in the championships.