The themes likely include pain and suffering. Since the girl is broken, the secrets and lies have probably caused her a great deal of emotional pain. Additionally, the theme of truth - seeking is probable. As the story unfolds, she may be on a quest to find the truth behind all the secrets and lies. And there could be a theme of isolation, as she might feel alone in dealing with all these issues.
Perhaps one theme is the shattering of innocence. If it's about a girl, she may have started out innocent, but the secrets and lies around her have broken that innocence, making her grow up faster and face the harsh realities of the world.
She might initially be in denial. For example, if she hears lies about herself, she may not want to believe that her friends could be so cruel. So she pretends that everything is okay.
It could be that in the story, the girl's friends were keeping secrets from her. For example, they might have been spreading lies about her behind her back, like saying she was a bad influence when she wasn't. The secret part could be that they were jealous of her for some reason, like her good looks or intelligence.
Obviously, the girl herself is a key character. She is at the center of the story as she is the one who is broken by the secrets and lies. There could also be a best friend or a family member who is either involved in the secrets and lies or helps the girl through her brokenness. Maybe a love interest could be another key character, who might have some role in either causing the situation or in helping the girl to recover.
It can be seen as a story about a girl whose world has been shattered by secrets and lies. The secrets might be things that were hidden from her, and the lies could be false narratives that she believed in, which have now left her broken.
I haven't read this specific fanfic, but generally, a 'girl with a scar' in a story often symbolizes some sort of past trauma or mystery. In a fanfic context, it could be related to the original source material's themes, like a character who has been through a difficult event and is now dealing with secrets and lies as a result. Maybe the scar is a physical reminder of something she wants to hide or something that others are using against her.
Once upon a time, there was a small village. A young girl named Lily had a big secret. She found a hidden treasure in the forest but told no one. However, her friend Tom noticed her strange behavior. Tom started to spread lies about Lily, saying she was stealing from the village. Lily was so hurt but couldn't reveal her secret. Eventually, a wise old man in the village noticed the truth. He made Tom apologize and helped Lily share her secret for the good of the village.
It's fictional. Most likely, the story was made up to engage the audience with interesting plotlines and characters that aren't based on real events or people.