Sabina is believed to have been killed previous year when fighting, the United Nations reports.
Last September, some tabloid reports by ISIS fighters, and/or that they'd been killed in battle.
Samra Kesinovic, 17, and her friend Sabina Selimovic became "poster girls" for ISIS after they arrived in Syria in April 2014.
The girls were just two in a long list of young and female Austrian nationals who have joined the bloodthirsty terror group in recent years.
When Kesinovic and Selimovic chose to join ISIS, they had left behind a letter to their parents saying: "Don't look for us".
Sabina Selimovic who travelled with Samra.
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Some reports suggest both are now dead, with the UN's David Scharia saying: "Both were recruited by Islamic State".
Photos posted to social media in the following months showed the pair wearing black burkas and wielding AK-47s.
An Islamic preacher from Bosnia living in Vienna - Mirsad O, known by the Islamic name "Ebu Tejma" was allegedly responsible for their radicalisation.
Now several Austrian newspapers are claiming Samra has been beaten to death, citing insider sources and an interview with a Tunisian woman who lived with the pair before escaping.
More than 120 people have left Austria to join the ranks of the ISIS extremist group. He said: "If we can catch them before they leave we have the chance to work with their parents and other institutions to bring the youngsters out of the sphere of influence that prompted them to act in this way [in] the first place".
