Is she too heavy?

I have a friend whom is 13 she is about 5 foot 3 and she is 120 pounds and she thinks she is fat I personaly think she is fine but what do you think? she is mostly muscle and not flab and thats why I don't think she is fat

At that age, girls go thru a stage where they still have 'baby fat' (some girls do). She will probably slim down when she gets interested in guys (or girls). She shouldn't worry unless the weight gets out of control.

girls are to be that heavy! gosh! it is totally healthy. most girls now a days are way to underweight!

yeah thats fine

that's about what I weighed when I was that age also. it's fine she's not overweight or anything that's a perfect weight.

 
She has a BMI of 21.25.

BMI is between 18.5 and 24.9 (Normal Weight)
People whose BMI is within 18.5 to 24.9 possess the ideal amount of body weight, associated with living longest, the lowest incidence of serious ilness, as well as being perceived as more physically attractive people than persons with BMI in higher or lower ranges. However, it may be a good idea to check your Waist Circumference and keep it within the recommended limits.

 
http://www.bmi-calculator.net/

shes perfectly fine
your freind needs to learn to love her body
and love herself
at 13 its not healthy to constantly obsess about her weight
there are more important things in life