Gossip Godmother

Zoey Whitmore is at a private school on a scholarship. She is the best student there and the others treat her as an outsider, which mostly takes the form of bullying. Then the gossip posts start. They are about her, they come from someone she cannot identify, and what they describe has not happened yet. It happens afterwards, the way the post said it would. Her mother is arrested and her boyfriend goes behind her back. Two people with real power fix on her at the same time, one a heartthrob with a royal name and the other the son of a crime family. The posts are of use to her. Knowing what is coming lets her get out ahead of the students who have been going at her, and she wins those rounds. Each win puts a harder problem in front of her than the last. The person writing them, who she comes to think of as her Gossip Godmother, keeps posting.