At first, Hermione would be heartbroken. She has shared so many experiences with the Weasleys. However, her strong will would soon take over. She would probably focus on proving her innocence if that was the cause of the betrayal. She might also try to find a way to reverse whatever situation led to the Weasleys' betrayal. If it was a matter of the Weasleys' own wrong beliefs, she would try to show them the truth, but if they refused to listen, she would distance herself from them while still remaining true to her own values and the greater good.
The Weasleys' perception of Hermione could shift in multiple directions. If the fanfiction explores her friendships in a new way, such as her bond with Ginny that was not fully explored in the original books, they might see her as more of a family - like figure. On the other hand, if the fanfiction focuses on Hermione's academic achievements in a way that makes her seem like a show - off, which is not really her true nature, the Weasleys might start to feel a bit distant from her. Also, if the fanfiction contains elements of Hermione's future plans and ambitions that are really far - fetched, they might initially be skeptical but then might start to encourage her to dream big if they sense her real passion for those things.
One possible plot could be that the Weasleys might betray Hermione over a powerful magical artifact. Maybe they believe she has become too power - hungry in her pursuit of knowledge about it and they side with those who want to keep it away from her.
Well, in many such fanfictions, the Weasleys might protect Hermione by using their magic skills. For example, they could create protective spells around her when she's in danger. They might also physically stand in her way when she's facing threats, like some dark wizards. And they would use their family influence in the wizarding world to keep her safe from any kind of harm or discrimination.
The Weasleys' reactions would be complex. Arthur, with his curious nature, might study the fanfictions to understand how Muggles view their world. Molly would likely be more conservative in her views, not liking any fanfiction that distorts the family values. The younger Weasleys would be more likely to embrace the creativity, with Fred and George looking for ideas to use in their pranks, and Ginny might enjoy seeing herself in different heroic scenarios.
Hermione could also be very hurt. Her hair is part of her identity, and having Draco, who she already has a strained relationship with, do something so cruel would cut deep. She might go to her friends, Harry and Ron, for support. They would likely be just as angry as she is and plot some sort of revenge against Draco and his Slytherin friends.
Harry would be extremely worried and determined to find a cure. He'd probably search every corner of the library and consult all his wizarding contacts. Ron, on the other hand, would be initially in shock but then would try to cheer her up with his clumsy humor.
Snape would probably be quite disdainful. He's not the type to be interested in fanfiction. He'd likely scowl and tell Hermione to focus on her real studies like Potions and Defense Against the Dark Arts.
Hermione could be a bit hesitant. She's very practical and might worry about how it would affect their friendship or what others would think. But if Harry was sincere and persuasive, she'd likely come around. She might ask him a lot of questions about why he wants to go with her, and once satisfied with his answers, accept his invitation.
Hermione might be shocked at first. She's a very logical person, and this sudden connection based on werewolf instincts could be quite unexpected for her. But then, being Hermione, she would likely start to study werewolves more intensively to understand what it means.
Ginny would be very empathetic. She'd probably try to understand Hermione's situation from a female perspective. Ginny might try to get some female friends or relatives to help out, like bringing food or warm clothes to Hermione. Luna would be her usual unique self. She might think that Hermione is on a special spiritual journey and would offer her some very strange but oddly comforting advice.