To be precise, she's being prosecuted for putting graphic (violent) content on a platform accessible to minors.

Le Pen, who lost to Emmanuel Macron in last year's presidential vote, is facing charges of circulating "violent messages that incite terrorism or pornography or seriously harm human dignity" and that can be viewed by a minor.

https://m.france24.com/en/20180301-france-marine-lepen-charg...