So she was falsely accused, detained for a week, and released with apparently no consequences? That's not great, but it's hardly a uniquely Japanese horror story either.
For comparison, back in the Land of the Free, here's a kid in New York who was jailed for three years on Rikers Island for a similar false accusation of theft:
https://www.newyorker.com/magazine/2014/10/06/before-the-law