One possible reason could be a curse that was placed on her secretly. Maybe an enemy from her past, someone she thought was defeated, managed to put a slow - acting curse on her. Another reason might be a side - effect of some powerful magic she used to save someone or solve a difficult problem. For example, if she used time - traveling magic in a wrong way, it could have negative consequences on her health.
Perhaps she has been poisoned. In the dangerous world of Hogwarts and the wizarding community, there are always those who want to harm the heroes. A jealous classmate or a Death Eater sympathizer could have slipped her a slow - acting poison, and she is trying to find a cure secretly so as not to cause panic.
It could be due to a genetic condition that she has just discovered. In the wizarding world, there could be some magical genetic diseases that are not well - known. Since she is so studious, she might have been researching something and accidentally found out about this condition that is slowly killing her. And she keeps it secret because she doesn't want to worry her friends and family.
They might be afraid of how their families will react. The Weasleys have their own ideas about who Fred should be with, and Hermione's parents, while muggles, might not understand a hasty and secret marriage. Also, there could be threats from dark forces. If the wrong people find out about their union, it could put them in danger, so secrecy is key.
Well, one reason could be to avoid the backlash from their respective families. The Malfoys and the Weasleys have a long - standing feud, so a secret marriage would be a way to be together without the immediate family drama.
One possible reason could be a vampire attack gone wrong. Maybe a rogue vampire targeted Bella and inflicted a near - fatal wound. Another reason might be related to some sort of dark magic or a curse that was unknowingly placed on her. It could also be due to a self - sacrifice situation where she put herself in harm's way to save someone she loves, like Edward or one of her friends.
One reason could be jealousy. Maybe her friends get jealous of Hermione's intelligence or achievements and act mean towards her in the fanfiction. For example, they might exclude her from certain activities or make snide remarks about her grades.
One possible reason could be her involvement in the wizarding world. If her parents are muggles and they find out about the extreme dangers she faces in the magical realm, they might disown her out of fear for her safety. Another reason could be if she starts to show more loyalty to the wizarding community than to her muggle family, making them feel like she no longer belongs with them.
In fanfiction, she could be injured during a battle against dark wizards. Maybe she was caught off - guard while trying to protect her friends.
One possible reason could be excessive stress. Hermione is known for being a perfectionist, and the pressure to perform well on the OWLS might have gotten to her, causing her to make silly mistakes during the exams.
Perhaps in this fanfiction, her parents have some secrets that Hermione discovers. These secrets could be related to the wizarding world and their connection to it. Their attempts to hide these things from her make her feel betrayed and thus lead to her hatred. For instance, if they knew about some dark magic in their family history but kept it from her.
At first, her friends might not believe it. They would think it was some kind of joke or a mistake. But when they realize it's true, they would come together. Neville, for instance, would offer any plants or herbs he has that might have healing properties. Luna would provide some out - of - the - box thinking and ideas that could potentially lead to a solution. Ginny would also be very involved, using her own skills and connections in the wizarding world to search for answers.
One possible reason could be jealousy. Maybe her friends are envious of Hermione's intelligence and magical abilities. In a fanfiction, this could lead them to betray her to gain an advantage or to make themselves look better. Another reason might be a misunderstanding. A miscommunication or false assumption could cause her friends to turn against her.