She is 8 yrs 4 months and her height is 121 cm. Is it proper as per her age?

A. New child is only 4 feet as of now I think it is quite less for the age because I am not certain about the genetics of the child but should be more than 4 feet so check how all the parents are what was the birth as per WHO check once if it says this is good nothing like it otherwise put your child into good physical activity for increment of height and overall growth and weight