Now...as a ger myself...i wouldnt like a guy to keep on
pestering me abt such a question even if im very close to
him.somehow,i'll find it quite irritating.
But, if you could do something to really touch her heart,to prove
it to her dat you are realli serious abt being with her,i think
most probably you'll succeed.but then this method does not apply to
all gers! :p
Anyway, try not to ask her on ur bdae.let say (touch wood!)she
rejected you again,then ur bdae will be a sad day liao.Try to be
happy on ur bdae,enjoy it,its ur dae!
Happy Birthday!! 
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As LoNg As I SHaLL LiVe
I'LL HoLd U dEaR
AnD I wILL rEMiNiScE
Of OuR LoVe ALL ThRoUgH
ThE YeArS....