"What you're like a robot?" Because her mind goes to building as creation. Although... "Wait, hold on, someone just created you to do their chores. But you're... intelligent. That's horrible! Is she keeping you as slaves?"

Even if he is a robot, he's clearly one who has a sense of self. And that turns her thoughts to the Ood, to the way they'd been treated before she and the Doctor had managed to wedge themselves into matters on the Oodsphere.