In astrology, the girls you will meet this
lifetime, for good or for ill, depends heavily on placing of your
Moon and Venus. Sometimes, its not about them, its about us. But
this would be in another topic.
Art of seduction - the only way to counter them is to know what
they are doing. Under Art of War (zi ji zi bi, bai zhan bai shen) -
knowing how your 'opponent' operates almost guarantee you a victory
in war because you can create a move, acting like a counterspell in
all her schemes.
She is mysterious because she hasn't knew you enough. There are
many thingy about her which she may/may not wants you to know
because she isn't too sure of her intention to you yet. If she sees
you are a potential friend, probably things would be as simple as
it is now. If she sees you as a bf material, then probably she
would work out a way to attract you. If she sees you as a kai zi,
similiarly, she will also work out a way. She is the kind of
people, who always desire to stand at an advantage, while keep
herself shut. 
To avoid being a kai zi is to avoid employing wealth as a medium to
foster good relationship.
Avoid or not doesn't matter. But seriously, you may not want to go
anywhere further other than a causal friendship.
P.S: She, being mysterious, is turn off for you. When you sit down
and think about it - it is this unique quality that attracts you in
the first place.
Is she a Scorpio?
Cheers
