Is it possible to be having a growth spurt at age 15 (girl) if puberty started late?

Yes: Although you may be nearing the end of your "growth phase," if the bone end plates have not completely formed, you may have some growth potential remaining. Growth hormone-releasing substances such as Sermorelen, or GHRP6 and GHRP2 may help. Find a physician familiar with these substances.

YES: Growth is a variable process during the transition of puberty. Late bloomers will usually finish their linear growth later than those who start early, but for girls there are some predictable markers.Menses is expected by 2-3 years after breast buds emerge and the hormones that support these markers also signal the bones to do their final growth. Expect an average of 2.5 inches after 1st menses.