One possible reason could be jealousy. Maybe she sees Harry getting too much attention or having relationships with other characters that make her feel left out and envious, which then turns into hatred and a desire to kill. Another reason might be a misunderstanding. Harry could be involved in some secret mission or activity that Ginny misinterprets as something harmful, leading her to think he's a threat.
It could be that Ginny has been possessed by some dark entity. In the wizarding world, possession is not unheard of. This dark entity could be using Ginny's body to get to Harry for its own malicious purposes. Or perhaps Ginny has made a pact with a dark force in order to gain power, and part of that pact requires her to kill Harry. This would show a much darker and more desperate side of Ginny than we see in the original series.
Well, in most of the established 'Harry Potter' lore, Ginny is in love with Harry, so a 'ginny tries to kill harry fanfiction' is a very out - of - the - box concept. It could be a dark exploration of an alternate universe where Ginny has been corrupted or influenced by some dark magic or external force that makes her turn against Harry. Maybe the writer wants to explore the extreme consequences of a character going completely off - their - normal - path.
Some people might create it out of a desire to shock others. They want to go against the norm and create a very different, controversial story.
One possible reason could be miscommunication. Maybe Ginny feels neglected by Harry because he's so caught up in his own heroic deeds and doesn't pay enough attention to her. So she might seek comfort or excitement elsewhere.
One possible reason could be that Harry has been spending too much time on his heroic duties and not enough time with Ginny. Another might be that he made a decision without consulting her, like taking on a particularly dangerous mission. It could also be something as simple as he forgot an important date or anniversary.
One possible reason could be a growing apart due to their different career paths. Harry, being deeply involved in the wizarding world's security and Ginny having her own Quidditch career. Another reason might be the stress of living in the public eye. Their relationship may not be able to withstand the constant scrutiny and pressure from the wizarding community.
One reason could be that the fanfiction is set in a different universe where the characters' personalities are slightly altered. So, this 'new' Harry just doesn't click with Ginny in that version. For instance, if the fanfic is a darker take on the story, Harry might be more jaded and not open to a relationship with Ginny.
In some fanfictions, Ginny may reject Harry because she wants to focus on her own personal growth. She might feel that a relationship with Harry at that time would hold her back from achieving her own goals, like becoming a great Quidditch player or an accomplished witch in her own right. So, she decides to reject him to pursue her own dreams first.
One possible scenario could be Ginny trying to control who Harry spends time with. For example, she might not like him being around Hermione so much because she's jealous. Another could be her trying to control Harry's actions in the wizarding world, like which quests or missions he undertakes. Maybe she thinks some are too dangerous and tries to stop him forcefully.
One possible reason could be a misunderstanding. Maybe she was misled by false information about Naruto being a threat to the village. Another reason might be that she was under some kind of mind control. In some fanfictions, dark magic or evil entities can take over a character's mind and make them act out of character.
One possible reason could be miscommunication. Maybe they had a big fight over how to raise their child and Ginny, feeling unheard, decided to leave. Another reason might be external pressure. For example, if some dark forces were targeting their family again and Ginny thought leaving would keep Harry and the child safer. Or perhaps Ginny had some personal issues she couldn't deal with while being in the family, like feeling she lost her own identity in the relationship.