How about laying her on a bed on her side with the sheets bunched up in the area's that are not so flaterring. I'm thinking a crisp white color or something in a solid. That way you can show the curves of her breasts, hips and legs. Another idea would be to have her sit on a dinning room style chair backwards (saddling it, like men sometimes do). That would hide her stomach (assuming it is not well toned, and then you could play with the different angles of her curves with the lighting. I agree with Misha about having her near a window. I've done that a few times for portraits and it gives the best results. You can even get real high key results near a window if you desire and that helps hide skin blemishes. It may also help to emphasize her eyes and hair. She has some nice features, so you should definitely be able to achieve some great results. Good luck to the both of you if you try for another shoot :)