One great fanfic could be 'Hermione's Trial of Pain'. In this story, Hermione gets injured during a dangerous spell - casting experiment gone wrong in the Forbidden Forest. It focuses on how her friends, especially Harry and Ron, come to her rescue and help her recover, all while dealing with the consequences of the magical mishap.
Harry and Ron would probably be very worried. They'd rush to her side immediately. Harry might use his skills to try and find a way to heal her quickly, while Ron would be freaking out a bit but also trying to be helpful.
Another aspect is Draco's reaction. He may be used to seeing Hermione as an adversary, but when he's injured by her, it changes things. He might feel a sense of betrayal, especially if he had started to see her in a different light before the incident. In some fanfictions, he has to deal with physical pain as well as the emotional turmoil of being hurt by someone he thought he could trust, at least on some level. This creates a complex web of emotions that fuel the angst in the story.
One possible fanfiction could be 'The Unforeseen Consequence'. In this story, Hermione accidentally casts a spell during a duel that seriously injures Draco. It then delves into the angst as Hermione is filled with guilt and Draco has to deal with his newfound vulnerability. The author does a great job of exploring their complex relationship in the wake of such a tragic event.
One great fanfiction with Draco and an injured Hermione is 'Healing Wounds'. In this story, Hermione gets injured during a battle in Hogwarts. Draco, surprisingly, steps in to help her, and their relationship takes an interesting turn from there. It's full of drama and some really sweet moments between them.
One great fanfiction with this plot is 'Slytherin's Compassion'. In it, a group of Slytherins come across an injured Hermione in the Forbidden Forest. They initially have mixed reactions but end up helping her. It shows a different side of the Slytherin house.
One idea could be that Sirius uses his knowledge of magic from his time as an Animagus and as a member of the Order to quickly heal Hermione's injury. Maybe he transforms into his dog form to track down any threats still lurking around her.
One common theme is redemption. Draco often has to face his past actions and prejudices when Hermione is injured. He sees her vulnerability and it makes him re - evaluate his views. For example, in many fics, he realizes that she's not just the 'Mudblood' he once thought she was, but a brave and intelligent witch. Another theme is the power of forgiveness. Hermione may be initially hesitant to accept Draco's help when injured, but as the story progresses, she may come to forgive him for his past wrongdoings.
A common plotline is Hermione getting injured during a battle or a dangerous adventure. For example, in many fanfics, she might be hurt while exploring an old, dark wizard's lair. Another is getting injured by a magical experiment gone wrong, like in some stories where she's trying a new, untested spell.
In some fanfictions, Hermione gets injured in the Forbidden Forest. Maybe she's exploring and stumbles upon a dangerous creature or a dark magic trap. This kind of plot allows for a lot of adventure and mystery. It also gives the author a chance to show how she copes with the injury in a dangerous and unfamiliar environment. And sometimes, she gets injured in a magical accident in the library while researching some dark magic, which can lead to all sorts of interesting consequences and character development.