this is a complicated question... you can't posses love.. its meant to be free... the most common advice for this would be.. keen observe
r... perhaps, you should try to get her attention... and if she gives importance to you... then, i guess thats one... try to ask personal questions... and if she answers openly, then thats 2... what else...

rape her....
rape her with your beautiful words of love.... be romantic... and if you were #2... I'm pretty sure... she'll make you #1.. in other words.... DISKARTE is a must.... Good luck though..