What ever you do just remember this
STAY OUT OF THE
FRIEND ZONE!!!!!!!
http://images.search.yahoo.com/sear...=jpeg&no=1&tt=4&oid=454a24200c64d5aa&ei=UTF-8whats NO2?
From your comments about her reacting to your criticism and seeking attention from all the males in the enviroment it is obvious she is "loooking for daddy's love". She probably had a POS as a father, if she even had one around. You need to play the dickhead daddy role or just pretend she doesn't exist (like a walkout dad) so she needs your attention to prove to herself she is ok.
Or fuck her sister...
THRICE!
If you have to play games, make someone jealous, or otherwise act outside your regular behaviour to get someone, it's not worth it. All you're doing is misrepresenting yourself.
Besides, why would anyone want to date someone who talks to you one day, then ignores you the next?
Maybe it's just me, but I prefer straight-forward non-gaming playing dating. I like you, you like me, let's go out. Simple.