Lots of good suggestions, thank you! And, ugh, thanks for catching the typo.
Some suggestions wont quite work though. Shay actually died in the book before this one, so changing "forgot" to "forgets" implies she dies in this book. And she doesn't care if she comes back as an angel or not, just that she gets back to the world of the living. Like I said, this is the 5th book, so my readers know who Shay, Jodi and Steven are - I really think explaining that at this point is redundant and takes up valuable space.
She died in Fire, a guy who knows Shay has magical abilities and thinks she's a witch, kidnaps her, ties her up and leaves her in a house to die in a fire and she doesn't make it out in time. Jodi and Steven dispatch the guy though. She was being groomed to be a guardian angel, but didn't know that once dead the Powers that Be would take her away from her friends and family, refusing to let her watch out for them, which is why she turns away from the light and in doing so they take her wings. The three of them are all so closely tied, they're soul mates and when Shay dies it actually hurts the other two and their powers are fading and Shay realizes that if she can't get back to them, eventually they will fade themselves, not just their abilities.
So I've rearranged a bit and changed a few words. Not sure if this is stronger.
No one, not even a guardian angel, is more powerful than Death.
Always careful to watch out for others, Shayna forgot to watch out for herself, trusting her abilities to keep her safe. But all it took to bring her down was a crazed human, trapping her in a fire. Now Shayna is trapped in the ether, among the restless dead. Turning away from the Light to stay with her friends, Shayna loses her wings. Unable to cope with the death of their soul mate, Jodi and Steven are beginning to fade; Shayna must find a way back to the world of the living to save them from a similar, cold fate.
But the longer Shayna stays among the lost and wandering wraiths, the further she slips from sanity. If Shayna cannot find her way back she will be condemned, lost forever among the restless souls of the dead. With nothing left to lose, she will do whatever it takes to fight her way back, with or without her wings.