The 17-year-old Samra Kesinovic from Austria and her friend Sabina Selimovic gained the fame of being poster girls of the terror group reached Syria in April 2014, reported the Mirror.
Sabina Selimovic was killed last year while fighting for the group.
Samra Kesinovic was caught by the group when she was trying to flee the ISIS stronghold of Raqqa. Her death report has got wide coverage in the Austrian newspapers.
Kesinovic and Selimovic children of Bosnian refugees fled to Austria from the war in their country during the nineties, went missing in April last year.
According to reports, they left a note for their families which read: "Don't look for us. We will serve Allah and we will die for him."
Authorities accused a Bosnian Islamic preacher identified as Mirsad O living in Vienna of recruiting the women. However he has denied the allegations.
As many as 130 people from Austria are now believed to be fighting as jihadists abroad.