Photo Illustration by Erin O'Flynn/The Daily Beast/Courtesy of Yousof Abedalazeez AbushabanThe author of this article is anonymous for reasons of safety.GAZA CITY—An American teenager has told The Daily Beast that his younger sister was killed by an airstrike in Gaza.The family says Joud Abedalazeez Abushaban, 14, died on Wednesday, after they went back home to Gaza City after several days waiting near the closed Rafah border crossing where they were trying to escape the country.Her brother, You