No mention of drugs or addictions in the story. It DID reference needing to pay off a lawyer and other debts. But much of it was trying to buy gas, and other "in store" purchases. There are limits on what stores you can use an ISU P-card at, and strict rules on what can be purchased. Unless you have an "entertainment" option on yours, restaurants, hotels, etc are not permissable. The entertainment is typically used to pay for recruiting new faculty, admin level "events" and the like. Unless she was an upper level (Sec 3 or 4) secretary working for a dept chair or dean or other admin, it's not likely she had that option. And it's doubtful that she would be an admin level sec in her early 20s.
My thoughts skewed toward all the hoops I had to jump through to use my P-card (and I did ALL of the purchasing for the lab). I even had to take short courses on purchasing nitrate solutions and certain other chemicals that were considered hazardous.