CAIRO — Malak el-Kashif left home on her birthday seven years ago. Walking into an uncertain future, she was underdressed for the weather and armed with little— except for some makeup, a few women’s accessories and 50 Egyptian pounds (at the time about six American dollars). “I was afraid but I didn’t hesitate,” she said. “There weren’t any other solutions.” That night, el-Kashif identified as a 13-year-old boy.