Fam, this was great. Seriously, I go to readings by the fiction and poetry students at the local college, and this would be politely applauded. One point of order tho:
as she ages out of the goth/punk/emo scene in the mid-sized midwestern city she never bothered to leave, she finds her social circle shrinking more and more
afaik most goth scenes are pretty welcoming to "original generation" people. I think this is also true about punk scenes. I don't know much about emo but I read that it's having a bit of a revival, i.e. clubs are having nostalgia "emo nights". So I don't think she would age out as you describe. What's more likely is that as her peers move away or drop out of the scene, she'd become bitter and/or gatekeepy and/or passive-aggressive so people would just start to be emotionally distant around her. Hmm... come to think of it, yeah, her social circle would shrink. But it wouldn't be directly related to age.