What is the ideal weight for a 157.5 Cm (5'2) 14 year old girl?
Charts say she should way about 99– 121 pounds.
You should, however take into account your BMI ( body mass index). Muscle weighs more than fat and you can actually look smaller with more weight.
Then there is the frame of a person and some take into the actual weight of bones which can change a persons weight a little.
The key be healthy. There are a lot of "fat thin people" out there. The key is to know the healthy difference.