Same thing sorta happened to me. I remember being measured when I was 12 years old at 5'6. I was so excited; i was finally the height of my mother! I though to myself "wow, I can't wait until I am 6'0, or even 6'3"! But, I stopped growing. I didn't grow at all after that. I tried talking to my mother, but by the time she started caring, my growth plates were already closed. Now, here I am, at 5'6.5", with my growth stunted.
That must be what she has also. Her development started at around 8 or 9. Was there a cause for your precocious puberty that could be determined?
Definition
By Mayo Clinic Staff
Precocious puberty is when a child's body begins changing into that of an adult (puberty) too soon. Puberty that begins before age 8 in girls and before age 9 in boys is considered precocious puberty.
Puberty includes rapid growth of bones and muscles, changes in body shape and size, and development of the body's ability to reproduce.
The cause of precocious puberty often can't be found. Rarely, certain conditions, such as infections, hormone disorders, tumors, brain abnormalities or injuries, may cause precocious puberty. Treatment for precocious puberty typically includes medication to delay further development