Answer: Call a day before delivery
Step-by-step explanation:
The best thing to do differently is to call Mrs Vernon a day before to confirm if Friday night agreement still holds. Also, calling a day before will also help Isabel to plan ahead, how ? . When she calls Mrs Vernon, there is a possibility that Mrs Vernon might be needing the flowers sooner that expected she would save Isabel time and cost of transportation, also, it is possible Mrs Vernon might not be needing the flowers anymore. So the different thing Isabel should do is reconfirm the appointment a day before in order to take the best step of the business.