Answer:
Step-by-step explanation:
I do a lot of drawing I'd love to help illustrate this but that's not the question. How about she's from some sort of ancient prophecy that describes a curse if a person does something that the prophecy says not to and that caused the unfortunate event of the crash and her awakening in a life much worse as a murderer.
Or instead have it be like she died and her spirit was swept away into the murderer whom coincidentally was also in some sort of event that caused his spirit to drift so they ended up somwhoe swapping bodies