Quote:
Originally Posted by Arwyn 
Biologically, yes. However, I'm of the mind that much of what we consider "adolescent angst" is at least as much a result of society and culture, and the contradictory expectations we have of teens (especially highschoolers), as it is biological/hormonal. To that end, I, who went through menarche at age 10, finished my biological development fairly early, but had a rough time throughout highschool.
I would also point out that biological adolescence is much longer than we typically think it is, with neurology and some organs taking much longer to reach a fully "mature" state than external appearance. (Although, of course, no one ever really stops "maturing", all Peter Pan jokes aside  )
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ITA.
While it is true that an early maturing girl will reach the biological end of puberty earlier, that won't necessarily be true for psychological and social aspects. Early maturing girls reach their full adult height earlier - their bones are finished with ossification earlier than an "on-time" or "late" developer. Thus, earlier developers TEND to be, on AVERAGE, shorter and heavier than late maturing girls. The late maturing girls' bones have a longer time to grow, and therefore, they do, indeed, grow longer.
Biological development isn't always on the same timetable as emotional and cognitive development.
Plus, biology interacts with society...early maturing girls may face other "issues." (I"m not saying that your DD will, but just pointing out what research finds, on average.) Early maturing girls are attractive to older boys. Plus, they are sometimes rejected by their on-time peer group, so they start hanging out with older kids, who they're not prepared to interact with socially. (They don't have the social skills to manage the relationships. To dissuade an older boy's (sexual) advances. Or to manage peer pressure.) So, early maturing girls are at risk for a variety of things (early sexual involvement, drug/alcohol use/abuse, depression, eating disorders). The problems with e.d. stem from having a body that is getting bigger (and different from peers), but not having the emotional development to handle it...
I do not want to suggest that your DD WILL have problems. In fact, she's probably in just the type of family that will help give her the social and emotional skills to handle her changing body, so she would be resilient in face of the risks that some early-maturing girls would encounter.