i don't have a bunch of details locked in, but frankie was a kid who grew up without a lot of adult supervision and was usually pretty capable at holding her own in most situations. i envisioned her getting into a spot of trouble with some older kids when she was a scrappy, tiny little 11 year old and the buffyesque figure stepped in to help her out and they've been stuck with each other since. frankie's an only child so she would have gagged at the opportunity to convince herself she could fit into a literal adult woman's clothes that she would have stolen and (sorry) torn up at the skate park, etc. you know, classic asshole dawn shit!