Even if the bus picked her up at the end of her driveway, she might still have been abducted while waiting for it. The long walk had nothing to do with her disappearance. She disappeared on a day she never got out of the driveway.
We don't really know this for a fact yet. Dog's aren't always right on when it comes to tracking people's scents, especially if a day or two has passed. If she was abducted, chances are it was close to her driveway, as the cul-de-sac was probably the most private place. But, if the bus stop was closer, the perp would have had less time and more of a risk at being seen if he thought the bus was coming closer to her house.