so im afraid that my friend is becoming anorexic. are these symptoms of this disease? she only eats breakfast (fruit) and dinner and she workouts out everyday and she is really concerned about her weight even though she is wears a zero. she always wear sweatshirts because she doesn't like the way she looks in t shirts. she is really concerned about people calling her fat or not skinny. and she is always trying to come up with a new way to lose weight. is that like maybe the beginning of anorexia?

Yep, it's likely a phase she's going through and hopefully she'll grow out of it before she does too much damage. my personal opinion is that nothing will help until the person hits bottom and gets exhausted from constantly worrying about weight.

Is she 15% below the prescribed weight for her age? Does she have distorted perceptions on weight and body image? Does she have eating disturbances? if so then yes she has anorexia. you should encourage her to see a doctor.