Absolutely. The best way to check your healthy weight is to use a Body Mass Index (BMI) calculator. Here is a good site for that stuff for your age group:
http://kidshealth.org/teen/food_fitness/dieting/weight_height.html#
I know you probably don't want to think of yourself as a "kid" at 13 (I know I didn't), but the weight/height comparison is a little different for teenagers than for adults because of all the changes your body is going through for puberty. Young teens require a higher percentage of body fat than you will as an adult. I took the liberty of entering your stats (height, weight, and age) and you are in the middle of the "healthy" zone. So you're perfect :-)
NO shes not over weight because the average weight for a 10 year old girl is between 95 and 110
110 lbs to 140 lbs.
The average weight for a nine year old girl is about 60 lbs., so overweight would probably be like 65+.
120 lbs
110 lbs
110 lbs
no
Slightly Overweight
Yes.
90 - 110 lbs
well im 9.1 stone which is at risk of overweight but it depends on your height coz im 1.65m.
Around 95-110 lbs.