Yes, I totally agree with Renee, what she told you above has been also advised for one of my neighbor's child. Some time It may because of parents weight also. If your weight is normal then you need to fix strict diet for her and may be consulting doctor will also help as fatness is also one kind of disease.
From your measurements, her weight is above the 97th percentile for her age. She is overweight for her age. For her age she needs approximately 1200 calories a day to grow. It is recommend increasing children's physical activities (play, dance, sports) to lose weight, and not lower calorie intake due to the need of calories for growth. Limit time in front of the TV or non-active-video games. There have been studies showing the longer the length of time a child sit in front of the TV, the greater the weight gain. Limit high sugar drinks/snacks, and try replacing with low fat milk/yogurt, fruit, air popped popcorn, or low-fat cheese. Additional suggestions: cook only low fat meats (chicken, fish, loin of pork) or non-meat sources (soy products, nuts), low fat vegetarian combinations (rice & beans, pasta & beans, low fat cheese & pasta), fat free or low fat dairy products (skim milk, 1% milk, low fat cheese, low fat yogurts, low fat soy milk/yogurt), use plant oils, non trans-fat margarines, and eat a lot of fruits, salads, and vegetables. Eat daily high fiber breads and cereals (oatmeal) and limit ‘junk’ foods. Hoped that helped you.