Perhaps in the fanfiction, the girl is a bit of a clumsy character. She gets a wedgie, which causes her glasses to fall off and break. This then sets off a chain of events where she has to get new glasses. But she's worried about what people will think because of how she lost the old ones. She might have to save up money for new glasses and in the process, learn to be more careful.
The obvious main character would be the girl who experiences the wedgie and loses her glasses. There could also be a bully who gives her the wedgie in the first place. Maybe this bully later has a change of heart and helps her look for her glasses.
In a fanfiction setting, the girl who tripped and lost her glasses could be a magical being in disguise. When she tripped, it could be a sign that her powers were about to be revealed. For example, she might be a fairy whose glasses were enchanted to hide her true identity. Losing them could lead to a series of adventures as she tries to retrieve them before the wrong people find out who she really is.
Perhaps the plot revolves around how this 'wedgie girl' without glasses has her appearance change so much that it affects her relationships. Her old friends might not recognize her at first, and she has to re - establish those bonds. Also, it could be that she becomes the target of a bully who likes to pick on her new look, but she stands up for herself in ways she never did before because of this new - found sense of self without her glasses.
A kind - hearted fellow passenger could help her. Maybe someone who is uninjured and has a good sense of orientation in the chaotic post - crash scene.
In a detective - themed fanfiction, the girl is tied up by the criminal she was investigating. She loses her glasses during the scuffle. The detective protagonist has to piece together the clues she left before being tied up, while also looking for her glasses which might hold some vital evidence. As he searches for the glasses, he gets closer to finding the truth and rescuing the girl.
The girl could be a young student who was abducted by bullies. The bullies tie her up, and during the process, her glasses are lost. A kind teacher or a fellow student who stands up to bullies could be the one to rescue her. They would then help her look for her glasses, which are important for her to see clearly in class.
Well, perhaps she could be helped by a mysterious stranger. He might be a wizard in a fantasy - based fanfiction. He could use his magic to repair her glasses if they were broken. And from there, a magical adventure could unfold as they journey together through enchanted forests and face various magical creatures.
The girl losing her glasses on the roller coaster could be the start of a really interesting story. It could lead to her meeting a group of other roller coaster enthusiasts who are also a bit clumsy or accident - prone. They form a bond over their shared experiences at the amusement park. Together, they search for her glasses, asking ride operators and looking in all the nooks and crannies near the roller coaster. As they search, they share stories and jokes, and by the end of the day, not only does she find her glasses (maybe in a really unexpected place like stuck on a seagull's beak), but she also has a new group of friends that she looks forward to going on more adventures with at the amusement park.
The fanfiction could focus on how the girl copes with losing her glasses while being missing. She might use other senses more acutely. Like, she listens more carefully to the sounds of the forest to avoid danger. Also, the discovery of her lost glasses by someone else could be a turning point in the story, either leading to her rescue or more complications.