At 3 years old she seems to wants to eat
healthy, which is a good. You can show her how to eat
healthy by being the role model not her brothers. If you do not have too much money, suggest buying only foods that are healthy and not 'junk' food. Eat a Heart Healthy diet which means a moderate fat diet to lower the fat content of your foods, increase ‘good’ fats to benefit your body, and cheaper when on a food budget.