The 24-year-old was arrested by federal police at her home in Granville in Sydney's west late on Sunday, after she allegedly sent text messages threatening to physically harm a person known to her.

She did not apply for bail as she faced Parramatta Local Court on Monday on three charges, including one of using a carriage service to make a threat to kill, which carries a maximum sentence of 10 years.

Namoa, who once described herself and her husband Sameh Bayda as a jihadi Bonnie and Clyde, was found guilty in 2018 of conspiring to do an act in preparation for a terrorist act with Bayda.

Their Supreme Court trial was told the pair, who were then 18-year-olds, married in an Islamic ceremony before Bayda's planned "attack" on non-Muslims on New Year's Eve 2015.

Their phones contained a vast amount of extremist material, including graphic images and videos of beheadings and soldiers carrying Islamic flags, while Namoa had a knife wrapped in a Shahada flag.

On her release from jail in December 2019, she was placed on a control order which she repeatedly breached, resulting in another stint in prison.

Namoa was released from jail in December on a second control order that again restricted her activities, including a ban on viewing depictions of beheadings.

She was also banned from communicating with certain people, including notorious gang leader Bassam Hamzy and anyone convicted of or charged with a terrorism offence.

Australian Associated Press