P.S. I'm Failing You

I'm not sure why students back instructors into the attendance corner. Why can't they just come to class like normal people. This semester I had a student who I gave more than enough chances to remain in the class. Even after I let her back into the class after five absences she missed again. Even after she signed a contract stating that she wouldn't miss any more class she did, and lied about having a doctor's note (a note that I never saw). With the realization that I had to fail this student I felt bad, but what else could I do?