Driving for 5 days does not imply or mean she was awake for 5 days. She drove five days, took breaks and stayed overnight at places, I am sure. I assume that because that is what I would do on a 2400 mile trip.
Driving 2400 miles at an average speed of 60 miles/hour would take about 40 hours, total.
Divide those 40 total hours by five days, and you get an average drive time per day of eight hours.
She was quoted as saying that she made the trip non-stop.