Anat Roth, dressed all in orange, was pictured kneeling with her head down as a woman dressed as an ISIS member stood over her with a knife.
Anat Roth wore the orange outfit - similar to the orange jumpsuits ISIS hostages wear - and posted a photo of herself on Facebook kneeling down in a similar post to the beheading victims in in execution videos.
Her photo drew angry comments, including one that called her mentally ill.
Ms Roth, is a former peace activist and was once an advisor to ex-Israeli prime minister Ehud Barak.