In a post to controversial social media network Gab, Chabloz wrote that she had been “questioned first by gendarmes and then Met CTU [Counter Terrorism Unit] under Sec 7 at St Pancras."

Chabloz was presumably attempting to refer to Schedule 7 of the Terrorism Act 2000, which gives police, immigration and customs officers the right to stop, search and hold individuals at ports, airports and international train stations, if subjects are suspected of involvement in terrorism or any other criminal activity.
Hope Not Hate, the anti-racist advocacy group, tweeted the news to its 89,000 Twitter followers on Monday evening, saying Chabloz “got a surprise trying to get into France this morning.”
Comments from respondents included: “maybe she can write a song about it that nobody wants to hear”, “fantastic news” and “vive la France.”
Holocaust denial is illegal in France. In April, a far-right activist, Alain Soral, was sentenced to a year in prison by a Parisian criminal court for Holocaust denial.