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Inside the Kurdish-run detention camp, al-Roj, in northern Syria, Australian Hodan Abby was labelled an enforcer of Sharia law. (ABC News: Baderkhan Ahmad)

It would come as a silent threat in the middle of the night — a niqab and a knife — left outside a tent in the squalid, prison-like detention camp housing Islamic State-linked families in Syria.

The message for the occupant was simple: wear the black veil preferred by the Islamic State (IS), or else.

This is one of the not-so-subtle acts in support of IS ideology that Sydney woman Hodan Abby is alleged to have been behind during her years in the Kurdish-run detention camp, al-Roj, in north-east Syria, the ABC can reveal.

She is the last known Australian IS-linked woman in Syria and was issued with a Temporary Exclusion Order (TEO) in February, barring her from returning to Australia.

That order was later revoked, and she was issued a return permit last month.

Hodan Abby left Australia for Syria in 2014 and ended up in a detention camp in the north-east after the self-declared caliphate fell. (ABC News: Baderkhan Ahmad)

A security source from within the camp — who doesn't want to be named — but who dealt directly with Hodan Abby — described the Australian as a cunning, threatening figure and the "driving force" behind many of the problems in the camp.

According to the security source, Ms Abby acted as what they called a "Sharia judge", or an enforcer of Sharia law, arranged marriages for IS women over the phone, and bribed other women in the camp with charity money to win their loyalty.