Abarat: Absolute Midnight, or Why I Think Somebody Needs to get Candy Quackenbush a Sandwich

So I just finished reading Abarat: Absolute Midnight.

Without giving too many spoilers, I just wanted to ask what exactly does Candy Quackenbush run on?

Examples:

• While Candy is depicted sleeping twice in the entire book, both times she's dream traveling. Not very restful.
• Multiple times she has her life force, her very essence, drained from her body. Then while she's one step from dead, forces herself to run away, despite any pain or discomfort or physical reliability left in her body from the stress.
• She does not eat. Food is talked about a few times, and the group that Candy is with even eats ("As Eddie paid for Betty's meal, Candy searched her pockets. She had two patterzem and some change." - Chapter 33) but before Candy herself puts any food in her mouth she's distracted looking for Malingo, meets an old acquaintance and the whole group decides it's time to run for their life.

Given this, my only possible conclusion is that Candy is solely sustained by magic throughout the book. That or the blatant Christ-figure references are to be deduced that she is a God and therefore does not actually need sustenance.