I know. Its allot harder, but there is ( or used to be ) this one tv show that had someone with high metabolism and someone with low. They followed a specific diet to get in shape. The girl with high metabolism eventually grew fuller after the specific diet. Its not impossible, it just requires a certain method.

I know, well not about the show, about the dieting that is. But dieting is tough, and on top of that most people don't really know what they should be eating for their body type and metabolism.

Agreed. That what the show is for. Merely saying that is definitely is possible for the girl in question to become fuller.