Just walk up to her or call her on the phone and say :
y helo thar buttsekz? LOLOL
That gets to the chicks every time
Also, on a more serious note, don't insist too much on the "madly in love with her" part. She might get scared because even if she likes you she'll think her feelings don't match yours, and she'll be afraid that once she accepts to see you, there'll be no way out because you're so all over her. Just act as if you like her a fair deal, but nothing more.