Except it is Maria Isabel who leaves their little Katherine Jasmine with Maria Isabel's aunt. I believe the author ended her book this way to demonstrate the United States' efforts to stop the flow of immigration, both in terms of the harm it causes to human beings and in terms of its futility. “When we build 700 miles of fence, honestly, we don't understand that kind of determination,” he said. Sonia Nazario also believes that mothers make mistakes especially in the eyes of their children when they abandon them to give their children a better life. He also believes that the best way out is to invest resources and policies towards the goal of improving those circumstances in the countries from which all these undocumented immigrants originated.