Maybe in the fanfic, Bella goes to the past and meets Carlisle when he is still struggling with his new - found vampire nature. She could offer him a different perspective on being a vampire, perhaps a more human - centered view. This could lead to a deep connection between them and change the way Carlisle interacts with other vampires in the future. It could also lead to a different relationship between Bella and the Cullen family when she returns to her own time.
I'm not sure of a specific 'bella goes to past meets carsile fanfic' off the top of my head. But you can try searching on fanfic websites like Archive of Our Own. There are often tags and search functions that can help you find stories with those specific elements.
The plot could be that Bell is sent to the past to observe Carsile for some unknown reason. As Bell follows Carsile around, they start to interact more. Carsile may initially be suspicious of Bell but then realizes that Bell has no ill intent. Their relationship could develop into a friendship or something more, all while they are navigating the complex world of vampires in the past, with different vampire clans and their own rules.
If Bell goes to the past and meets Carsile, it could also create a ripple effect. Their meeting might not only change their individual stories but also the stories of those around them. For example, Carsile might introduce Bell to other vampires, and Bell's presence could cause friction or cooperation among them. This could lead to new alliances or rivalries, which would completely reshape the original storyline. Also, Bell's actions in the past could have unforeseen consequences that spread throughout the entire world of the story, from the vampire side to the human side.
One possible plotline could be Naruto using his knowledge from the future to prevent certain tragedies. For example, he might stop the death of a beloved character like Jiraiya.
Maybe Bella will have some amazing adventures with Peter in the past. She could witness historical events together with him, or they might fall in love in that different time period.
A possible plotline could be that Bella goes back to Phoenix to find some normalcy after the heartbreak in Forks. She might try to pick up the pieces of her old life, like going back to school there or re - connecting with her human friends. Another plotline could be that she's on a mission to keep her family in Phoenix safe from the supernatural threats she now knows about.
There are many fanfics that play with the idea of time travel. For Bella going back in time to meet Jasper, the story could explore how their prior knowledge of each other in the future affects their initial meeting in the past. For example, does Bella already trust Jasper because she knows him from the future? This could create a really unique dynamic in the story.
Another plot could be that Bella is sent back in time by some magical force related to Elijah. When she arrives, she finds Elijah in a difficult situation, like being trapped by an enemy. Using her wits and any powers she might have, she helps him escape. This starts a chain of events where they become allies and then, over time, more than that. They might travel through different historical events together, with Bella always having the knowledge of the future in the back of her mind to help them out.
One possible plotline could be that the 2013 BTS is transported to 2021 and they're shocked by all the changes. They meet their future selves and at first don't believe it's really them. Then they start learning about all the things they've achieved over the years.
One possible plotline could be Bella trying to hide her deafness from her friends and family while facing challenges in communication. For example, she might misinterpret situations because she can't hear everything clearly.