The student has shared her FRAME OF REFERENCE.
Frame of reference is defined as customs, values, concepts, views, etc. by which an individual or group perceives or evaluate data, communicates idea or regulate behavior.
The end of the play portrayed an unpalatable scene to the student, as Nora left her husband. She (the student) had gone through the same ordeal, and therefore knew how it feels.
THIS EXPLAINS A CONCEPT WHICH REGULATED HER BEHAVIOR, HENCE, HER FRAME OF REFERENCE.