OK, I see what you did there...(spoilers)
...kinda. Instead of the Final Girl actually being the Final Girl, and the spirit being put to rest, you've upended the formula and made the Final Girl swap places with a Vengeful-For-NO-Good-Reason Spirit, who wins.
What I'm not sure of is why. If you're going to upend a perfectly good formula, you have to have a reason other than Because It's There. Otherwise, we're just going WTF? LAME! at the end, which was my reaction. No one really did anything to Angela that deserved erasing, so what? The movie is really about an evil, obsessive creepy little girl in a coma who stalks her old friend, erasing all of her current friends before putting her in a coma instead? Cool story, bro, but i'm not diggin it.