She's sitting in a funny way, but she looks slender, not anorexic.
Eskinomad has it right, I think. Many of us (not just 20 something) are overweight. I think, for instance that when a person is of the "right" weight, they should be a little "ribby" like a sight hound. I also think that underweight is healthier than overweight. I think that an Anorexic person has an eating disorder in which they do not want to eat. That is different than someone who eats a decent amount of calories and is slim.