One possible plot could be that Bella had a family secret in her past that is now resurfacing. It could be something related to her ancestors and she has to face the consequences or revelations that come with it. For example, her family might have been involved in some sort of mystery or even a wrong - doing in the past and she has to make amends or at least come to terms with it. This could involve her having to face some angry descendants of those affected by her family's actions in the past.
It might be that Bella had a horrible accident in her past that left her with physical or emotional scars. In the fanfiction, she could be on a journey to heal these scars. She might meet someone who helps her see that she can move forward, but first she has to confront the memories and the pain associated with the accident. This could involve flashbacks to the moment of the accident and her struggle to come to terms with what happened.
Well, perhaps it could involve Bella dealing with past traumas like the loss of a loved one. Maybe she was bullied in the past and is now trying to overcome the insecurities that came with it.
Her best friend could be a main character. This friend could be the one who has always been there for Bella, through all the hardships of her past. They might try to protect Bella from the things that are resurfacing from her past, or they could be the one pushing her to face her past head - on. For example, the friend might find out some new information about Bella's past and decide that it's time for Bella to know the truth, even if it's painful.
Well, it could be about Bella having a secret power that she has to hide from the world in the fanfiction. Maybe she can communicate with animals secretly and is afraid of being seen as a freak.
One possibility is that Bella's secret could be about her having some special power that she has been hiding from everyone in Forks. Maybe she can communicate with animals secretly, which adds a new layer to her relationship with the werewolves.
It could be about a misunderstanding. Renesmee might think Bella is being overprotective in a wrong way, like not allowing her to have normal relationships with others. This misunderstanding can escalate into a fight as Renesmee rebels against Bella's restrictions.
One possible plot could be that Bella is in a difficult situation in her life, perhaps she is not ready to be a mother due to various reasons like her age, career prospects, or relationship instability. The story might then focus on her emotional turmoil as she makes the decision to have an abortion, dealing with the judgment from society or her family.
One possible plot could be that Paul believes Bella has some special power or knowledge that he desperately needs. So, he kidnaps her in order to extract that information from her. However, as time passes, he starts to develop some unexpected feelings for her, which complicates the whole situation.
In the fanfiction, Bella might be having surgery due to an accident. She was in a car crash or some other mishap. The story could focus on her recovery process after the surgery. How she has to relearn to do simple things, and how her relationships with the people around her change as they help her through this difficult time.
Perhaps in this fanfiction, Bella had the kid in unexpected circumstances. She might be trying to keep the identity of the father a secret from the kid and the town. As the kid grows up, he or she starts to ask questions, and Bella has to decide whether to tell the truth or keep the secret, which adds a lot of drama to the story.
It could be about Bella's journey of motherhood, like how she takes care of the baby, the challenges she faces in raising the child, and how it changes her relationship with others.
One possibility could be that Bella is in a world where having multiple mates is common. She might struggle to balance her feelings for both mates. Maybe one mate is more adventurous and the other is more nurturing, and she has to figure out how to incorporate both relationships into her life.