There's no way to disable the paddle shifters, I doubt even the dealer can do that. She'll learn over time to shift on her own and treat it as a manual. It's not hard to do. Even for a blonde.
Seriously, if any driver needs to disable innate features of the car because they haven't learned them, don't disable the feature. Learn to use it. Learn to drive on ice, water, snow, dirt, without freaking out. Learn to pass, shift, swerve. Anyone can learn these things. And everyone should. We're all safer for it. Even at 1800 lbs, this hunk of steel is a deadly weapon and the driver is 100% responsible for its proper use.