Another plot could involve Elena's transformation causing a rift in her relationship with Stefan or Damon. As a vampire, she may have different desires and values, which could create tension and drama. There could be a love triangle aspect where she is drawn to a new vampire character while still having feelings for the Salvatore brothers.
It could be an old vampire who sees Elena as a threat to his power or territory. Maybe he doesn't like the idea of a newly - turned vampire causing a stir in the vampire community and decides to take her out.
Well, in the fanfiction world, if Klaus turns Elena into a vampire, she would probably have a whole new set of challenges. Firstly, she'd have to deal with her new bloodlust. Elena, being a very empathetic person, might struggle a great deal with the urge to feed on humans. Also, her relationships with her friends would change drastically. Her human friends like Bonnie and Caroline might be a bit wary of her at first. And her relationship with Damon and Stefan would also be on a different level. Damon might see her as a more equal partner in the vampire world, while Stefan might worry about her losing her humanity.
The consequences could be complex. On one hand, they might grow closer as they face the challenges of Elena's new existence. But on the other hand, Elena might struggle with her new identity and blame Stefan for turning her. This could create tension and strain in their relationship.
Caroline, for example, might be more accepting as she is also a vampire. She could help Elena adjust to her new life. Damon, on the other hand, might be jealous or feel threatened that Stefan made Elena a vampire. It could change the power balance between the three of them.
In such a fanfiction, a lot could unfold. Elena might face conflicts with other supernatural beings or have internal battles with her morality as a vampire. Also, there could be romantic complications with the people in her life.
Katherine turning Elena into a vampire changes her life in many ways. For one, Elena's diet changes. She has to resist the urge to feed on humans. Socially, she becomes an outcast among normal humans. Her perception of the world also changes. She starts to see the vampire society in a different light and has to find her place within it.
The story changes a lot. For one, Elena's place in the supernatural world shifts. She goes from being a target of vampires to being one of them. This means she's now part of the 'in - crowd' in a way. Her daily routine would be completely different. Instead of going to school during the day, she'd be prowling at night. And her relationships with the other characters would be redefined. Stefan and Damon would have to see her in a new light, and she might start to have a different understanding of Klaus too, not just as a threat but as someone who has given her a new kind of life.
Their relationship would likely become more intense. With a baby on the way, there's a new level of commitment. Damon might become more tender and less reckless, as he now has Elena and the unborn child to think about. Elena would probably rely on Damon more, trusting him to protect her and their future family.
Well, in such a fanfiction, Elena might befriend Lissy and Josie. Maybe they'd share stories about the supernatural world. Since Elena has her own experiences with vampires, werewolves and witches, she could offer them some unique perspectives. And they could also help Elena adapt to the new environment she might find herself in.