My thanks to the nice people at Walker for sending the book.
If they like this kind of existential wondering, they might also enjoy [[Skinned by Robin Wasserman]], in which Lia survives an equally devastating car accident, and looks at a religious reaction to her as a "mech head". [[Being by Kevin Brooks]] has a Bladerunner-style take on this theme. I can see the exploration of future longevity in [[The Declaration by Gemma Malley]] appealing, too. And of course, there's the devastating [[Unwind by Neal Shusterman]]. You might also enjoy [[Through To You by Emily Hainsworth]].