Amirah Droudis, 34, was in November 2013 charged with the murder of Monis' former de facto and mother-of-two Noleen Hayson Pal.
Ms Pal, 30, was stabbed and set alight at a Werrington apartment block on April 21, 2013.
Droudis was granted bail in December but this was revoked by chief Magistrate Graeme Henson during a hearing at the Downing Centre Local Court on Monday.
NSW Attorney-General Brad Hazzard had last week asked the Director of Public Prosecutions to immediately review the decision to grant Droudis bail, after questions were raised about Monis' bail arrangements.
Deputy senior Crown prosecutor John Pickering SC argued Droudis posed a risk given the content of a video tendered to the court.
In the video she speaks about terrorism, he told the court.
"There is no evidence that view has changed," he said.
Mr Pickering noted Droudis hadn't breached any conditions of her bail.
But the crown had worries her extremist views were "still operative".
Droudis' defence argued the DPP application was based on irrelevant evidence.
"The video appears to be nothing more than ... (Droudis) being a spokesperson for Mr Monis," her legal representative told the court.
However, Mr Henson said there was an unacceptable risk that could not be mitigated by imposing conditions.
"The case against the accused is stronger than it was 12 months ago," he said.
NSW Attorney-General Brad Hazzard had last week asked the Director of Public Prosecutions to immediately review the decision to grant Droudis bail, after questions were raised about Monis' bail arrangements.
Monis was on bail when he took 17 people hostage inside a popular CBD cafe last week.
The siege ended 16-and-a-half hours later with the death of barrister Katrina Dawson, shop manager Tori Johnson, and Monis.
Monis had been in and out of custody at various periods in 2013 and 2014 after being charged with a number of offences, including being an accessory to the murder of Ms Pal.
In December last year, he was granted strict conditional bail following a three-hour hearing.
Then, six days after the new NSW bail laws came into effect, Monis was again released from custody on May 26 after being charged with fresh offences relating to the aggravated indecent and sexual assault of a woman in 2002.
He was deemed to pose an "unacceptable risk to interfering with witnesses and endangering the safety of victims and individuals in the community".
But this was to be offset by tough bail conditions, including reporting daily to police.
Mr Hazzard has asked the DPP to review any other cases where bail has been granted and where there may be any similarity to the circumstances of the Monis matter.
Droudis' case is due in Penrith Local Court on February 27 when she will appear by audio visual link.
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