To avoid further confusion I will refer to all editing and revision tasks as "retelling" you can determine how much revision is needed. We'll revisit project hope but for now go back to bad endings #7. Kelly will be the "Hero" or at least the likable object of sympathy.
Rachel will be the bad ass. A nasty piece of work in the beginning but she changes and evolves learning to regret her impulsive decision.

You can make most of these changes within the structure of the story as it stands or you could expand it using the "bad ending" as a centerpiece to the story (with necessary 'retelling within that structure) Add a preliminary chapter that sketches the two personalities, the attraction from both points of view, and the conflict that develops. The Bad Ending chapter is of course an imperfect resolution but work it the way you wish. The ending chapter needs to show Rachels building regret and what she does about it. I know you've said she can't find Kelly but what would she do then? Also fill in a little about Kelly's fate and her reaction to it.

Hope that will keep you busy for a bit.
Mad & Lews