Murad escaped successfully in November 2014, after three months of abuse and torture, and made her way via a refugee camp to seek asylum in Stuttgart.
Two Austrian teenage girls who joined the Islamic State have reportedly used social media to refute claims that one of them is dead.
She described how last summer she was a student living in the village of Kocho in northern Iraq when ISIS fighters rounded up all Yazidis, killing 312 men in an hour and taking the younger women into slavery.
After being taken to Mosul, Murad and the others were held for three days before being "distributed" among fighters.
A woman who was taken as a sex slave by the ISIS militant group has described how she and other young women were forced to pray before they were raped.
Nadia Murad, 21, was among more than 5,000 Yazidi women taken captive when ISIS, also known as the Islamic State, ISIL, or Daesh, swept through northern Iraq.
She has been speaking out about her horrific experiences at the hands of ISIS fighters, who bought and sold her and women like her as sabia, or slaves.