It might be due to a dangerous experiment gone wrong in the wizarding world. For example, if she was working on a complex potion or a new spell, and something unexpected happened, resulting in her injury.
In fanfiction, she could be injured during a battle against dark wizards. Maybe she was caught off - guard while trying to protect her friends.
Perhaps in the fanfiction, she was exploring an ancient and dangerous magical place. There could have been hidden traps or curses that injured her as she was delving deeper into the secrets of the place.
Another reason could be an accident. In some fanfictions, the setting might be more of a daily - life scenario with a twist. Perhaps Usagi is distracted while walking and trips over something, resulting in an injury. This can add a touch of realism to the otherwise fantastical world she lives in.
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.
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.
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.
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.
One reason could be his own clumsiness. Maybe Peter is always in a rush and not paying enough attention to his surroundings. For example, he could be running down the stairs while looking at his phone and trip, resulting in an injury.
Perhaps it was a result of friendly fire or a mistake by an ally. This would add an interesting layer of drama and conflict, especially if there are trust issues that need to be resolved.
It could be that she sees the pain she caused Harry and it makes her feel guilty. In the story, perhaps she was influenced by others' opinions of Harry and didn't trust her own long - standing friendship with him. When she finally comes to her senses, she regrets all the hurtful things she said or did.
One possible reason could be ideological differences. Maybe she discovers some practices within the Order that go against her moral compass. For example, if the Order starts to use unethical magic in their fight against the dark forces, Hermione, with her strong sense of right and wrong, might not be able to tolerate it and decide to leave.
One possible reason could be jealousy. Maybe she sees the Weasleys as getting things too easily in the wizarding world compared to her own hard - earned achievements. For example, they have a big family support system that she lacks, and she might envy that.