First off, I don't think this is much of a representation of her usual work. If it's a favorite of hers, perhaps it's simply because she enjoyed the feeling of doing something different from her personal status quo.
She's certainly a master self-promoter. I found her work a few years back via a portrait book she had just put out. I would not call her an amazing photographer by any means, but she does what she does consistently, so at least her clients know what to expect. She does rely heavily on assistants and make-up artists and stylists.