When psychic with a conscience Jasmine Winters warns her worst enemy of an impending serial killer attack, she learns that killer may be closer than she thinks and now he's after her.
OR Psychic Jasmine Winters is about to find out which is harder: saving her worst enemy from a serial killer; learning someone she loves might be that serial killer; or finding out she's a target of that killer.
I like the second one because I like that list (though you need commas, not semicolons, in the list). And I'd maybe go with a dash for a pause before the last one, just so there's that breath of finality.
Psychic Jasmine Winters is about to find out which is harder: saving her worst enemy from a serial killer, learning someone she loves might be that serial killer-- or finding out she's a target of that killer.
Just a couple thoughts: I like "psychic with a conscience" and if you go with the second line, I'd use that before her name. And consider putting in some action-- you have "is about to find out," but that's pretty passive. Is about to discover might be stronger. Must discover? You have "Find out" twice in the sentence, and you don't want that.
And think about definite articles -- "a target" is indefinite, sort of formless. THE target sounds more focused, more critical. (And yeah, maybe he's got more than one target. Who cares? She's still THE target. Don't water down the danger.:)
Anyway, I do like that list! Think about strengthening the first part of that line. Does she find out through her psychic ability? Or some other way? You could add on something to the beginning, like "The crystal ball is telling Jasmine ..."
Again, experiment, and aim for precision and focus. But I do like the list! I think it's clever and sets up her conflicts in an intriguing way.