Is it true that girls generally stop growing two years after her first period?

Generally, yes.: There is such a wide variation in heights in girls, but generally, by about two years after the first menstrual cycle much of the really rapid growth spurt has occurred. Go to the website: http://www.Cdc.Gov/growthcharts/charts.Htm. Click through until you reach the girls' growth chart of the appropriate age. Plot your daughter's height to age, and you can get a close approximation of final height.