In late November 2014 militants on social media started claiming that Rosenberg has been captured, along with several other female fighters by ISIL perhaps during the Siege of Kobanî. This was denied by Kurdish officials who said she was nowhere near Kobanî. On December 1, Rosenberg updated her Facebook page, saying that she was safe. If captured, she would have been the second Israeli dual citizen, after American-Israeli journalist Steven Sotloff, and the first Canadian, to be held hostage by ISIL. There was also speculation that, if she had been captured, Canada might have mounted a rescue operation to retrieve her.