Actually there ws nothing to stop her 'virtual' chassis that was visible through Dale's glasses from flying.
Look at it this way; she's already getting vision that's constructed whole-cloth out of a camera view or several that aren't particularly close to her. That's a neat trick you can do in software, but in our world it usually takes a few seconds per frame to integrate stuff. In Jeph's world, though, Strong AI is around and something the size of Pintsize can store Terabytes of porn. So I'm assuming they've got a hell of a lot of compute power for relatively "trivial" tasks like video composition.
So in a virtual chassis, all she'd have to do for loops and swoops and high-in-the-air views of the world over a city, would be to hijack the video feeds of a whole bunch of security cameras down in the city. That's probably criminal, and fairly difficult, but hey, it ought to be child's play for someone (almost) capable of embezzling $.75B from her former employers.
Of course, she probably wouldn't be satisfied with flight as a 'ghost'.