As I don't know the exact story, it's hard to say. But generally, key elements could include the trigger that started the conversion, like a new experience or person. For example, if she started reading self - help books after a difficult time in her life.
I'm not sure specifically which Sally's read conversion story you are referring to. There could be many Sallys with different conversion stories in various contexts, like a religious conversion story or a conversion in her reading habits. Maybe you can give more details.
In these kinds of stories, Sally is usually the main character. She is the one who experiences all the scary events. She could be a curious adventurer who stumbles upon the unknown and has to face her fears. For example, she could be a local in a town full of haunted legends who decides to check out an old, supposedly cursed place. And that's where all the horror begins for her.
Well, it's difficult to determine. Maybe it's a fictional creation, or it might draw some inspiration from real-life incidents, but without more information, it's tough to be certain.