Bella's human relationships would be greatly affected. Her friends like Jessica and Angela might start to notice that she's different. She'd no longer be able to participate in normal human activities with them, like going to the movies during the day or having a normal meal together. Her relationship with her mother would also be in jeopardy. Her mother might sense that something is off, and Bella would have to be very careful not to expose her new vampire self.
After becoming a vampire in the fanfiction, Bella's human relationships face numerous challenges. Firstly, her school friends would find her increasingly distant. She'd be preoccupied with her new vampire abilities and instincts. Her relationship with her boyfriend (if she had one as a human before) would be over. Vampires and humans don't mix well in that sense. And her family ties would become tenuous. She'd be living a double life, hiding her true self from her family, which would eventually lead to a lot of emotional turmoil for everyone involved.
Well, one consequence could be that she has to distance herself from her human friends. Since she's now a vampire, she might be afraid of accidentally harming them. For example, her scent might be too alluring to them, and she could lose control. Also, her family relationships would change. Her father, for instance, would be left in the dark about her true nature, and she'd have to keep lying to him, which would create a strain on their relationship.
One possible fanfiction could be about Bella adjusting to her new vampire life while Alice, as a human, has to deal with the knowledge of the supernatural world in a different way. Maybe Bella tries to protect Alice from other vampires who might see her as a target because of her connection to Bella.
To adapt to her new vampire life in the fanfiction, Bella has a long journey. At the beginning, she struggles with her speed. She might accidentally run too fast and crash into things. But with Alice's guidance, she learns to control it. Her vision also changes, and she has to learn how to focus in different lighting conditions. Socially, she has to interact with other vampires. Some might be friendly, like those in Alice's coven, but others could be hostile. She has to learn how to defend herself and navigate the complex vampire politics. She also has to come to terms with the fact that she'll live forever now, which means leaving behind her human concept of time and mortality.
For Edward, it could be a huge shock and a source of internal conflict. He might struggle with his feelings for Bella as a vampire, different from the human Bella he fell in love with. The Cullen family might be divided in their opinions. Some might be worried about Bella's ability to control her new vampire instincts, while others might be more accepting.
A plot could be that Bella, as a vampire, has to pretend to be human around Alice's family. This would involve a lot of hiding her powers and dealing with the difficulties of being around humans all the time. Another idea is that Alice, as a human, discovers a way to make Bella more 'human - like' again, and they embark on a journey to find the ingredients or perform the rituals necessary.
I'm sure there are. The Twilight saga has a huge fan base, and fanfiction writers love to play with different scenarios. Bella's character is central to the story, and her relationship with vampirism is a key aspect. A story where she turns into a vampire as a result of suicide could be a way to explore deeper emotions, different character arcs, and new relationships within the Twilight universe. However, such a topic can also be quite dark and might be treated with different levels of sensitivity in different fanfictions.
Perhaps some of the other Cullen family members would be her allies. They are already vampires and could help her adjust to her new powers and the vampire lifestyle. For instance, Alice might use her power of seeing the future to guide Bella in making important decisions. Jasper could teach her how to control her new vampire instincts, like the urge to hunt. And Emmett could be her sparring partner to help her improve her combat skills.
Well, Bella is usually the center of attention. She's the one who bridges the gap between the wolf pack and the vampires. The wolves are presented as having a strong sense of community and loyalty. They might be in conflict with the vampires at times because of their different natures. Alice, on the other hand, is like a guiding force. She uses her gift to foresee events that could impact Bella and the others. Vampires can be made to seem more human - like in their emotions or they could be the ultimate predators, and it all depends on how the author wants to tell the story in the fanfiction.
One interesting aspect could be how their relationship dynamics change. In the original, Edward was the vampire and Bella was the human, so reversing their roles might lead to a different power dynamic. For example, Bella as a vampire would have more physical strength and speed, which could make her more protective of Edward. Also, Edward as a human might struggle with his mortality compared to Bella's immortality, creating new tensions and storylines in the fanfiction.
One interesting plot could be Bella's struggle to control her new vampire instincts. For example, she might have a hard time dealing with her sudden urge for blood while trying to maintain her relationships with her human friends and family. Another plot could be her discovery of new vampire powers that are unique to her. Maybe she can do something no other vampire can, like communicate with animals on a deeper level.
One consequence could be that she has to deal with new relationships. Her human friends might be scared of her, and she has to learn to interact with them in a new way. Also, she may face challenges within the vampire community. Some vampires might not accept her easily because she was once human.