Elena was at a school party and called her mom, telling her that she needed to come home from the school party because of Matt talking about marriage, having children, thinking that she might break up with him. Later, she is spotted walking alone on the highway. Damon was lying in the middle of the road and upon seeing her, he thought that she was Katherine. Her parents arrived, but before she left, he compelled her to forget that they even met, mainly because Damon didn't want anyone to know that he had arrived in town yet. Elena's dad was driving the car, when suddenly he drove off the bridge. Stefan was nearby and he wanted to save Elena's dad first, but he insisted that Stefan save Elena first. Stefan carried her to the shore and when he came back for Elena's parents, it was already too late and they had drowned. This happened again caused by Rebekah, Elena died and became a vampire.
In Stay, it was revealed that Greyson planned a surprise trip to their Lake House. However they never made it due to taking the bridge after an storm took down an tree on the most direct route. This explains why they took Wickery Bridge that night. The storm also explains why their was no brake marks on the road. It was also revealed that the urgent message that Miranda left Sherrif Forbes was because she wanted her to bust Jeremy for smoking.