A criminal charge has been laid against Simone Abigail Kriel for allegedly posting antisemitic and inflammatory messages on her Instagram page on 16 May.
According to the SA Jewish Report, Kriel, 28, lives in Pretoria and is relatively well-known in fitness circles.
David Saks, associate director of the SAJBD, told News24 that Kriel was given a deadline to remove the comments and apologise for it, which she refused to do.
Saks said the comments came "out of the blue" and that Kriel had previously dated a Jewish man, and had at one point considered converting to Judaism.
Kriel reportedly said the videos infuriated her and that she now believed "the Holocaust was a set-up, executed by Hitler's men, at the cost of millions of Jewish lives".