Did she actually say she wanted to be more “womanly and curvy”? If so, get her to define what exactly she means.
Still, as others have noted, there’s nothing anybody can do to change her body type. Ideally, she (and you) would place more emphasis on what she likes, her strengths, and build on that.
Does she have any other goals? (cardiovascular, muscular, flexibility, for instance). Maybe focus on those…