Answer:
Anorexia nervosa
Step-by-step explanation:
Anorexia nervosa is an eating disorder in which an individual becomes obsessed with food and their weight as a result of exaggerated fear of being overweight or fat. This psychological condition is characterized by low body mass index, starvation, fear of being obese, low self-esteem, restriction of food, and in some cases might involve using laxative to aid weight loss.
Shelly is most likely suffering from anorexia nervosa.