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Isabella Nalda, bottom, and her mother, Eileen, place flowers at a makeshift memorial for Kayla Mueller, a 26-year-old American woman who was kidnapped, brutalized, raped and killed by Abu Bakr al-Baghdadi, leader of ISIS, Prescott, Arizona, February 10, 2015 (Credit: AP Photo/The Daily Courier/Matt Hinshaw)

Isabella Nalda, bottom, and her mother, Eileen, place flowers at a makeshift memorial for Kayla Mueller, a 26-year-old American woman who was kidnapped, brutalized, raped and killed by Abu Bakr al-Baghdadi, leader of ISIS, Prescott, Arizona, February 10, 2015 (Credit: AP Photo/The Daily Courier/Matt Hinshaw)