One way could be through the use of time - turning. If she could go back in time to before her parents' memories were altered, she could prevent it from happening. However, this would be extremely dangerous and against the laws of time in the wizarding world. But in fanfiction, the rules can be bent. Hermione is known for her intelligence and determination, so she might be willing to take the risk.
She could also seek the help of very powerful and wise magical beings. For instance, she might journey to find a centaur who is known for his knowledge of rare and complex magic. The centaur could guide her in creating a potion or performing a ritual that would bring back her parents' memories. Additionally, some fanfictions might have her use her own powerful magic in a unique way. Since Hermione is extremely intelligent and magically gifted, she could figure out a way to tap into her own latent power and use it to reverse the charm she placed on her parents.
Her parents might be in danger. Since Voldemort was after her, now that they remember her, they could become targets. The Death Eaters could use them to get to Hermione.
I remember reading a fanfic called 'Restoring What Was Lost'. It delved deep into Hermione's emotional turmoil while attempting to restore her parents' memories. The author beautifully described her fears of what would happen if it went wrong. It was a really unique take on the concept as it also incorporated some elements of Hermione's research in the Hogwarts library to find the right solution.
Often, there's a countdown or a time limit involved. Maybe there's a magical condition that if not met within a certain time, her parents' memories will be lost forever. This adds a sense of urgency to the story. Also, the use of Hermione's own guilt and determination as a driving force for her to keep trying in the face of multiple failures is quite common.
One interesting aspect of Hermione Granger and her parents in fanfiction could be exploring how their Muggle background affects Hermione's Hogwarts experience. In some fanfictions, her parents might be more involved in the wizarding world than in the original series, which adds a new dimension to Hermione's story.
One great Hermione and her parents fanfiction is 'The Granger Family Reunion'. It beautifully explores the relationship between Hermione and her parents in a post - war scenario. The story delves deep into how they cope with the changes in Hermione's life due to her experiences at Hogwarts. Another interesting one is 'Hermione's Muggle Roots', which focuses on how Hermione's parents influenced her values and her journey in the wizarding world.
One popular theme is family reconciliation. Since Hermione is often so involved in the wizarding world, fanfictions might explore how she reconnects with her Muggle parents after a long time. Another theme is the discovery of Hermione's family's hidden magical heritage. It could be that there are some secrets about the Granger family that are revealed in the fanfiction.
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.
This abandonment could make Hermione more independent. She might have to learn to fend for herself earlier, relying less on others for emotional support. It could also make her more distrustful at first, but as she grows, she might learn to open up again through the friendships she forms, like with Harry and Ron.