The fanfiction deviates significantly. In the original, Bella's feelings for the Cullens are mostly positive or at least intrigued. However, in this fanfiction, her hatred might stem from different plot developments. For example, in the original, the Cullens are presented as somewhat heroic and mysterious in a positive way. But in the fanfiction, new events could be introduced that make Bella see them in a bad light, like they might be involved in some sort of unethical activities that change her perception completely.
In the original Twilight story, Bella is initially attracted to the Cullens, especially Edward. But in this fanfiction where she starts to hate them, it's a complete contrast. It shows a different side of Bella's character, one that is more critical and less forgiving. In the original, she is more likely to overlook their flaws because of her love for Edward. Here, she focuses on the negative aspects.
Well, it could be due to the way the Cullens interact with the other people in Forks. If Bella notices that they are being manipulative or using their powers in a way that she doesn't like to influence the townspeople, that could make her start to hate them. Also, if there is some kind of power struggle within the Cullen family that starts to affect Bella negatively, like she gets caught in the middle of it or she sees how it's causing harm to those she cares about, she might turn against them.
In some fanfictions, the Cullens might hate Bella because of jealousy. Maybe other vampires are jealous of the attention she gets from Edward. Another reason could be that she brings too much danger to their family. Her presence could attract unwanted attention from other vampires or vampire hunters, which puts the Cullens at risk.
She might start by giving them the silent treatment. Just ignoring them completely when they try to talk to her, which would be a very human way of showing anger.
It could be that the fanfiction writer took a different approach to the story. In some fanfictions, the Cullens could be involved in situations that go against what Bella stands for. Perhaps they are written to be more secretive and untrustworthy, leading to Bella's hatred.
It's possible that in the fanfiction, the Cullens are involved in some sort of betrayal. For example, they might side with someone who is against Bella. This act of betrayal would be a strong reason for her to hate them. In fanfiction, new storylines can be created where the Cullens' actions are not in line with what Bella expects or desires, which can result in her hatred.
In some fanfictions, Bella might accidentally harm one of the Cullens, either physically or emotionally. This could lead to them hating her. Also, if she were to side with their enemies in a conflict, that would definitely make them dislike her. For example, if there was a feud between two vampire groups and Bella chose the wrong side, the Cullens would not be happy with her.
Bella's character development in this fanfiction might be seen in her emotional growth. Initially, she might be a bit naive and overly curious about the Cullens. But as she grows up with them, she becomes more understanding and empathetic towards their situation. She may also learn to control her emotions better, especially when it comes to the dangerous aspects of the vampire world. For instance, instead of panicking all the time, she starts to think rationally and find solutions. Moreover, her relationships with the Cullens shape her into a more complex and well - rounded character. Her bond with Edward might deepen in new ways, and her friendships with the other Cullens could also influence her values and behavior.
Bella is obviously one of the most popular. Since she is the main character in the original series, in fanfiction she often remains the central focus. Her relationships with the Cullens, especially Edward, are often explored in great depth.
One interesting plot could be Bella developing a new power while living with the Cullens. For example, she might gain the ability to communicate with animals like some of the other vampires. This would add a new dynamic to her relationship with the Cullens and also pose new challenges and adventures as they try to keep it a secret from the outside world.
Her relationship with Jacob would likely change. Since she hates the Cullens, she might turn more towards Jacob for support. They could become closer as she sees Jacob as an alternative to the Cullen world. With her human friends, she might try to distance herself from any connection to the Cullens. So, she could be more secretive or withdrawn from them as well to avoid any talk about the Cullens.