Her Other Fucking Problem is that she seems to have internalised some teasing from mean! pretty! girlswithtits! far more than is good for her or anyone else.

Totally. I can easily picture myself saying something very similar when I was a miserable 14 year old indie snob who hated girls in make-up and short skirts (and they hated me, because I was a miserable 14 year old indie snob).