They were leaving Forks. Edward had convinced the entire family that it would be better if they parted ways with Bella. They were too dangerous to be around her and Edward wanted her to have a chance at a normal life. Of course Alice was the first to object. Bella was a danger magnet, how long did they think she'd last with them gone. Edward was completely overreacting and it made Alice furious. Carlisle and Esme eventually talked to her into it with the help of Jasper who was sending waves of calm at her. He informed the family that he would talk to her and make a clean break. Alice wanted to say good bye, but Edward forbid it.
The months during the time that they had left Forks, Alice was increasingly unlike herself. She tried to put up a facade in front of the family, but Jasper could hardly be fooled because of the emotions that pooled off her. Jasper was a gentlemen about the whole thing. Alice had admitted her feelings for Bella, but what surprised her was Jasper had seen this coming. He knew from the emotions that they emitted when they were around each other it was only a matter of time. He told her to follow her heart and go after Bella, tell her how she felt.
Alice was in midst of packing a suitcase or two, when she was hit with the sudden vision of Bella jumping of a cliff. She never got to see what happened after that, her vision faded. She was very alarmed by the vision, she hoped that Bella didn't just kill herself. Alice would then have to explain to Charlie that it was all their fault, if they hadn't moved away it wouldn't have happened. Alice didn't tell Carlisle and Esme that she was leaving. The only person that knew was Jasper. While on the road she called Rosalie and told her of the vision. She asked her to inform Carlisle and Esme about it.
She must have doing about a hundred miles per hour back to Forks in Carlisle's Mercedes. Alice parked the car on the street and let herself in to Bella's house. She didn't hear anyone home, so she sat in the dark and waited for someone to return. Bella had committed suicide and it was their fault. When she heard noises outside. Someone was coming into the house. She moved to the hallway and turned on the light. Gasped at the sight of Bella alive. A mryiad of emotions when through her, guilt, happiness, relief, confusion.
"Bella, how are you still alive?" she asked in a weak voice.