Thanks, everyone, my current problem, is how to make her look older, without changing her into a completely different character, because I want to keep her looking mostly the same, but I don't want her to look too damned young.

I just realized that I have the Growing up product for G8 female, and I have been messing with that and I immediately started by using the older teen setting and it really didn't change her much that I noticed. There was more change when I decided to try the adult setting, and it really didn't change her that much either, though it was more noticeable. I'll fiddle around with it and post a few different settings. Also, The entire body is basically the same as the Krashwerks character I used except for a few tweaks here and there which were nothing drastic because it was an almost flat as a board type of character I was going for, and as for the ability to build muscle for teen girls.. It may not be the easiest thing to do but I know it's possible because my sister did back when she ran track, and she was pretty good at it, but I take your point.