Hi, this seems to be case of anorexia nervosa. There are many reasons for anorexia like some illness,
infection, stress, depression, breakup, over protectiveness, adolescence, psychological disorder etc. Due to
anorexia hemoglobin level decreases which causes weakness, tiredness. Some studies suggest that a gene located
at chromosome 1p seems to be involved in determining a person?s susceptibility to anorexia (stomach upset).
You can take food you like to maintain energy level in body. Take fruits, milk, vegetables. I suggest her to
consult psychiatrist and dietician for Psychotherapy and Nutritional therapy, respectively. Take care and