It's her right hip that's missing. Chen drew an exaggerated slanted view of her shoulders and didn't carry it all the way through the hips. She choose to turn them instead and have us view them from the side instead of above. It's awkward and wrong.
That being said, Jo Chen is one of the exceedingly few cover artists out there that I enjoy on a regular basis. She rarely screws her anatomy and is brilliant on likenesses!