i agree...no girl is unintentionally flirty...
but some girls are always intentionally friendly, and every guy misinterprets it as flirty because it's in every man's DNA..(it really is heh)
so the point>>>>it doesn't matter
who cares if she's being friendly or flirty..here's what you do..or what i would do
get her number if you don't have it already...
then, call her and set something up for a weekend..don't ask, tell her you're doing something and it'd be fun if she came along/she should come along...then pause
she'll say, "sure, it sounds great!" or "let me check to see (if i have time/i have a ride/etc...and she actually checks and tells you she's free)" these are the two responses you want to hear
or she'll say "let me think about it and call you back" or "i dont really like (insert suggestion here)" or "maybe" or if you're lucky, LUCKY, LUCKY...she'll say "no." or "sorry but i'll pass"...a direct girl, my favorite
or she'll say "i don't like (insert your suggestion)...how about we do this instead?" i read someone worth reading on SS say that you shouldn't let a girl change the activity within the first two months or first 3-4 outings because it's a power thing...but he was writing for older people..not high school kids...so if she has a legitimate reason, then you should change activities..but if it's some bull**** AND you have confidence..say "well maybe we can do that next time i'm free...i'll get back to you later..bye"
I say confidence because Pook, i''m pretty sure..once said..
"Confidence is a refined sense/form of patience"...so you'll need confidence/patience