Alice has the power to see into the future. The premonitions she experienced as a human are intensified in her vampire life, and she uses them to her advantage in order to keep her family safe. It mainly works by her focusing on a certain object or person and keeping track of its decisions. She can also focus on several objects at the same time, up to the limit her mind allows. Her power is also one of few not affected by Bella's shield. She makes extra money by using her power to predict windfall investments in the stock market. As a human, she only received visions at certain times while at most times, she felt the predictions.

The vision shows up after someone's decision, which probably means that her power is working all the time like a system alarm, no matter the distance of the target. If a decision is made quickly, she fails to foresee it.

She can predict the weather easily, and knew exactly the instant when the lightning struck which allowed her to be the one to pitch the ball in the baseball game.

Book One

Alice helps Bella get ready for her wedding by helping her with her dress and make up and giving her her garter. Bella is not yet informed about the honeymoon's destination so Alice packs her bags for her. When Bella first looks in her suitcase she is surprised to find that Alice packed a lot of lingerie. It is Alice's tampons which makes Bella realise that she has missed her period and is pregnant.

Book Two

Whilst Bella is pregnant, Alice can no longer see her future and it gives her headaches so she spends most of her time hidden away from her family. She is relieved when Jacob, Seth, and Leah arrive because their presence numbs the pain. Alice becomes very close to Jacob, as they bond over their hatred for Bella's baby and how he numbs the pain she feels. After Rosalie almost loses control, Alice grabs her to forcefully pull her away until she could control her blood lust again.

What Alice does in Eclipse. Keeping up a common theme here...

Being liked by Charlie, she, unlike Edward, has unlimited visitation rights during Bella's punishment for leaving for Italy in New Moon. Alice has a vision of Victoria coming back. After Bella's successful attempt to sneak past Alice's vision to visit Jacob, Edward bribes Alice with a canary yellow Porsche 911 Turbo to kidnap Bella so she won't go to La Push to visit Jacob while he goes hunting for the weekend. Eventually Bella escapes with Jacob while they are at school, but Alice gets her Porsche anyway.

Victoria creates an army of newborn vampires and manages to evade Alice's vision by letting Riley choose her warriors, but Bella figures out her plan and tells Alice this on graduation day. They decide not to tell Edward, so Alice must keep her mind busy all day. That night at the graduation party, she receives a vision of the army's coming and the family prepares a battle strategy led by Jasper, while also forming allegiance with the wolves. During the fight training, Alice uses her visions to become the only one to be able to defeat...