My mistake. I didn't realize it might be hard to help without knowing the context of the story, or my character.
Basically, it's a Silent Hill RP and my character has been pulled into the town due to a "sin" or some deep dark secret. It doesn't necessarily have to be something she was involved in directly.
I ran through most of the "usual deep dark secrets" I could think of. Like murdering someone but it was self defense, having an addiction of some sort, witnessing a crime but not doing anything about it, etc. But none of them seemed to really "fit".