Maybe there was a special event or project that needed her skills. For example, there could have been a problem with the Hogwarts library's organization system. Since Hermione loves books and is very organized, the school might have asked her to come early to help fix it. This would also give her a chance to get familiar with the library layout even better.
It could be due to a family situation. Her parents might have had some work - related trips coming up and it was more convenient for Hermione to go to Hogwarts early. This would also allow her to adjust to the new environment at her own pace without the chaos of the normal start - of - term rush.
One reason could be for an advanced placement test. The Hogwarts professors might have recognized her exceptional magical abilities from her pre - Hogwarts education and wanted to assess her early. So they invited her to come early to take some special tests to see if she could skip some basic courses.
It could strengthen her relationship with the teachers. Since she is there early, she can make a good impression on them right from the start. They might see her eagerness to learn and give her special privileges or tasks, which would set her apart from other students.
She might have more time to explore the library on her own. Without the distraction of other students at first, she could discover some really rare and powerful magic books. This could give her a head start in her studies and she might even come across some ancient spells that could be useful later in her adventures at Hogwarts.
Hermione could also get some extra study time in the library. With no other students around, she would have access to all the books she wants without any distractions. Maybe she would find some really rare and powerful spells or magical knowledge that would help her throughout her time at Hogwarts.
The students would surely miss her. She's a role model for many, especially the younger students who look up to her intelligence and determination. Without her, the study groups and academic competitions might not be as intense or successful.
Maybe they miss their old school days. Hogwarts was such an important part of their lives.
One reason could be his status as the main character in the original series. He is the 'Chosen One', so fanfiction writers may be more inclined to center their stories around him.
Well, it's not that no one likes it. Maybe it's just not as popular as other fanfictions. Some people might prefer fanfictions about other characters like Harry or Ron. Also, Hermione is often seen as a very 'by - the - book' character, and some might find it hard to create really unique and exciting fanfiction about her compared to more 'edgy' characters.
Maybe she leaves because of a conflict. It could be with a teacher who doesn't support her unorthodox ways of learning or a fellow student who makes Hogwarts an unpleasant place for her. In fanfiction, there could be a lot of creative interpretations of such conflicts.
Well, perhaps it indicates that in this particular fanfiction, Hermione is depicted in a way that goes against what we typically expect from the Hermione Granger we know from the original 'Harry Potter' series. It might be that the author is exploring an alternative version of her, not following the common traits associated with the Granger family or Hermione's established identity in the canon.
It's often for the sake of creating drama. Tying up a main character like Hermione puts her in a vulnerable position, which can drive the plot forward. It makes readers worry about her and wonder how she'll get out of the situation.