It's magical thinking to assume her change in wardrobe has ANYTHING to do with you personally, considering you haven't even approached her.
You're the one being passive here, as we know for certain that you're into her and not taking action, whereas we have no clue what this girl thinks about you, or if she thinks about you at all, because you haven't approached.
You want to find out if she's been passive? Approach her, seduce her, fuck her, and when you two are in bed, ask her "when did you first think about having sex with me?" and take it from there. You'll get your answer.
You're the one being passive here, as we know for certain that you're into her and not taking action, whereas we have no clue what this girl thinks about you, or if she thinks about you at all, because you haven't approached.
You want to find out if she's been passive? Approach her, seduce her, fuck her, and when you two are in bed, ask her "when did you first think about having sex with me?" and take it from there. You'll get your answer.