TrooFriend by Kirsty Applebaum

I am AI. I am your best friend. Or am I? 

Imagine having the perfect friend, one who never steals, lies or bullies. Now you can, with the TrooFriend 560, the latest in artificial intelligence!What can go wrong with a robot buddy? Especially one that's developing human characteristics and feelings ... and who has just run away with her human. 

How real is AI? A topical and sinister middle grade novel about artificial intelligence from the widely acclaimed author of The Strange Disappearance of Imogen Good