If I were to think of the most benign interpretation, HRC did not want to drive to the office and sit in a small, dark room for many hours, reading top secret documents. She wanted to read what she needed to read on her cell phone, wherever she is. She did not want to be at a party and receive a phone call like "Come to the office, there is a report you need to read right away." She had probably received such calls a few times, and then started demanding that the staffer emails her the relevant portions of it.
You are being very generous. I think the truth includes her selfish convenience but that she was also up to no good and didn’t want anyone including Obama to know, last of all, her bosses, We the People.