Couple comments - can you get her to put her diet into a food counts program like
www.fitday.com and post up the macro ratios ? (i.e. % and grams of each protein , fats & carbs for 1 day's typical meal plan). Eating those foods is all great but look a level lower at the macronutrient composition to optimize. (e.g. 40% protein / 30% carbs / 30% fats).
Also once you know the bodyfat - I'd suggest not fixating on the scale for settign goals or measuring progress - you can change the ratio of lean muscle mass to bodyfat and never see the scale move once. At the min go by how the same pair of pants fits over time in addition to looking at the scale. But too many people, esp women, judge progress only by the scale and set their goals by the scale when it is more important to decrease your bodyfat / increase your lean muscle mass to make whastever you weigh look better. Also remember that the scale can reflect 5-8 lb swings in weight due simply to water fluctuations and that sometimes manages to really kill people's motivation or belief in what they are doing - water weight fluctuates all the time so it makes the scale weight not the best and most absolute measure of progress.