The Swan Riders - Erin Bow

Treacherous twists await Greta as the stakes get even higher in this stunning follow-up to the "masterful" (School Library Journal, starred review) novel, The Scorpion Rules.
Greta Stuart has become AI. New transmitters have silvered her fingerprints. New receptors have transformed her vision. And the whole of her memory has become one book in a vast library of instant knowledge. Greta is ready to rule the world.
But the new technology is also killing her.
Greta is only sixteen years old, but her new enhancements are burning through her mortal body at an alarming rate. Of course the leader of the AIs, an ancient and compelling artificial intelligence named Talis, has a plan. Greta can simply do what he's done when the time comes, and take over the body of one of the Swan Riders, the utterly loyal humans who serve the AIs as part army, part cult.
First though, Greta will have to find a way to stay sane inside her new self. Talis's plan for that involves a road trip. Escorted by Swan Riders, Greta and Talis set out on a horseback journey across the strange and not-quite-deserted landscape of Saskatchewan. But there are other people interested in Greta, people who want to change the world...and the Swan Riders might not be as loyal as they appear...