Perhaps not 100%, but I'd find ways to be "around" though would ignore them/act disinterested. A lot of girls were and still are flat-out, hold-nothing-back, in-your-face boy crazy, leaving no room for misinterpretation: calling boys, passing them notes (sometimes via a friend or slipping them in their lockers), writing a boy's name all over her notebooks, following the boy(s) in the halls....
I remember some girls giggling a lot around a boy they liked. Nervousness, I suppose, at least with some girls.
No matter how a girl reacted, it was undeniably awkward. Smmmmoooooooth isn't part of any 13 yo love life.