if this is a talking point written for her to repeat it probably came from a Muslim writer because the throwing a shoe at some one is a Muslim insult in origin.
Remember when George W. Bush ducked two shoes thrown at him in a joint press conference with Iraq Prime Minister Nouri al-Maliki? That's probably where the alleged shoe incident originated. Imagine 41 throwing a shoe at a TV when his own son had been disrespected so badly in Iraq. Not.