Hi Mani,
Some tips for your girl friend to lose weight. Exercise regularly to burn fat and boost metabolism. Break meals in small frequent meals and prefer raw food over processed food. Drink more water than routine, have green tea and have proper sleep.
To reduce your girl friend's extra body weight, engage her in any physical activity and add fun in her workout to stick her with fitness programs. Add fruits and vegetables more in her meals and tell her to take small frequent meals. Avoid her to eat shortly before going to bed and manage stress. Toplevelfit Personal Trainer