A young Yazidi woman who fled to Germany as a refugee has returned home to northern Iraq after coming face to face with the ISIS militant who held her as a sex slave for three months.

Ashwaq Haji, 19, says she ran into the man in a German supermarket in February. Traumatised by the encounter, she returned to Iraq the following month.

Like many other Yazidis, she was kidnapped by ISIS when the extremist militants seized large areas of Iraq in the summer of 2014.

In their ancestral region of Sinjar in north-western Iraq, thousands of Yazidi women were killed or sold off as sex slaves.

The teenager was held from August 3 until October 22, 2014, when she managed to escape from the home of an Iraqi jihadist using the name Abu Humam who had bought her for US$100 (Dh367), she told AFP in the Yazidi shrine of Lalish, north of Iraq's second city Mosul.

The Yazidis are a Kurdish-speaking religious minority that was brutally persecuted by the extremists, who despise them as heretics.

Under a German government programme for Iraqi refugees, Ashwaq, her mother and a younger brother were resettled in 2015 in Schwaebisch Gmuend, a town near Stuttgart.

Her refuge in Germany, where she took language lessons, was cut short on February 21 when a man called out her name in a supermarket and started talking to her in German.

"He told me he was Abu Humam. I told him I didn't know him, and then he started talking to me in Arabic," she said.

"He told me: 'Don't lie, I know very well that you're Ashwaq'," she said, adding that he gave her home address and other details of her life in Germany.

She immediately phoned the local police, who told her to contact a specialised department.

The judicial police in the Baden-Wuerttemberg region of south-western Germany said an inquiry was opened on March 13 but that Ashwaq was not present to answer questions.

A spokesman for the German federal prosecutor's office told AFP that so far the man's identity could not be confirmed "with certainty".

Germany says it has opened several investigations over terrorism charges or crimes against humanity involving asylum seekers linked to extremist groups in Iraq, Syria or Afghanistan.

Ashwaq Haji visits the Yazidi temple in Lalish, northern Iraq, where she lives after fleeing Germany. AFP

Ashwaq said she had viewed surveillance videos filmed in the supermarket together with German police and was ready to keep them informed of her whereabouts.

But she said that she was not willing to return to Germany for fear of seeing her captor again.

She is back in northern Iraq with her mother and brother, but living in fear because she says Abu Humam has family in Baghdad.

She wears black in a sign of mourning for five brothers and a sister still missing since their capture by ISIS.

At a camp for the displaced in nearby Iraqi Kurdistan where he has been resettled, her father, Haji Hamid, 53, admits returning was not an easy decision, even though the government proclaimed victory over ISIS at the end of last year.

"When her mother told me that she'd seen that jihadist... I told them to come back because Germany was obviously no longer a safe place for them," he said.

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Life in Iraq is not easy for Ashwaq or for the 3,315 other Yazidis who escaped from ISIS capitivity. A similar number are still being held or have gone missing, according to official figures.

"All the survivors have volcanos inside them, ready to explode," warned Sara Samouqi, a psychologist who works with Yazidis.

"Ashwaq and her family are going through terrible times."