A woman facing trial for alleged anti-Semitic activity online has had her bail conditions tightened by Westminster Magistrates.

Alison Chabloz, 52, a musician, is due in court in March 2017 to face a private prosecution brought by the Campaign Against Antisemitism (CAA) and its chairman, Gideon Falter. At issue is a video she posted in June 2016 called “Survivors”, in which she appears to question the Holocaust, calls Auschwitz a theme park and describes the gas chambers as a hoax.

The CAA brought the prosecution after the Crown Prosecution Service decided not to proceed with charges.

Chabloz, who has had a high-profile presence on social media, was originally given unconditional bail after her first mid-December appearance before Westminster Magistrates.

But after new online material emerged, some of which allegedly related to Gideon Falter’s family members and additionally to prosecuting barrister Jonathan Goldberg, QC, she was summoned back to court last Friday and new conditions imposed.

Chabloz. from Glossop, Derbyshire, has now been ordered “not to post or send or cause to be sent via the internet or any other means, whether via social media or at all, any message or other material relating to Gideon Falter or his family; Stephen Silverman or his family; and Counsel or solicitors acting for the private prosecutor or their families and in particular, nothing which might lead to the identification of their home or professional addresses”. Stephen Silverman is the CAA’s director of investigations.

She has also been ordered “not to post or send or cause to be sent via the internet or any other means, whether via social media or Youtube or at all, any message or other material which is in whole or part racist or anti-Semitic and grossly offensive”.

Chabloz denies improper use of public electronic communications network.