Probably flagging her down because they ordered, pizza delivery drivers used to before the days of GPS have a hard time finding my house so I’d walk down to the nearest intersection about twenty minutes after ordering to watch for them and flag them down.
But she said “deliveries,” not pizzas. It seems to me that, between driving back and forth, parking, delivering, and going back to the restaurant to pick up new orders (and sometimes wait for them), it might be difficult to maintain a constant rate of 5 deliveries per hour.