EXAM oh EXAM

Yesterday I was called by the exam unit. They asked to give a report regarding one of my students. This student claimed she overlooked the exam timetable and didn't come for the exam. Oh my goodness!!!!! I was wondering how can she forgot one most important days in her life?. Didn't she reconfirmed about the timetable? Why didn't she ask her friends? Didn't any of her friends notice her that she was not around during the exam? Is it really her carelessness or she has any other reason? Only she and God know the answer.