There are no statistics on how much a 12-year-old, 4-month-old, 155-centimeter girl’s height will increase after she has her period, because height is affected by a variety of factors, including heredity, nutrition, sleep, and physical activity, so there is no way to tell how much taller your child will grow. You can consider taking your child to the radiology department of the hospital for an epiphyseal examination to make a preliminary judgment of the room for growth. If your child’s epiphysis has already closed, there is no way for him or her to continue to grow in height; if the epiphysis has not completely closed, you should pay attention to proper nutrition, get enough sleep every day, and exercise moderately in order to promote the increase of your child’s height. After puberty, girls will have the development of secondary sexual characteristics, including breast enlargement and menstruation, but it does not mean that the growth stops, it is recommended to take your child to the hospital for a checkup, to clarify whether the height can still be increased.