Will my girlfriend's take a different shape?

My girlfriend is a little over weight and I've been wondering what shape her body will take after a serious weight loss. I know that her body in general will shrink and take a better shape, but will her remain the same or lose a cup or two, become perkier and so on? What will happen? And also after the weight loss, will her l parts ( lips, outer area, etc...) take a different shape as well? Can someone please answer this for me? Thanks!