Answer: Class of 2004
Elle graduates Harvard Law School, with honors, in the Class of 2004. This fact is revealed when Elle is speaking at graduation. While she is speaking, you can see the Class of 2004 banner above her head. Also, in Elle's video that she sends to get into Harvard, she mentions that she would like to be a part of the Class of 2004. While Elle makes her graduation speech she mentions about how first impressions can be wrong and how Professor Stromwell quotes Aristotle on Elle's first day of law school.