how long have you been with her?
It would help if we all knew what "type" of a girl she was..But here are some suggestions.
(1) A nice romantic dinner where you romance her and give her her gift
(2) buy her a gift..(new earrings, a new necklace, some thing with sentimental value in it)
(3) after dinner and gift giving bring her home to rose petal covered bed and woo her all night long.. massage, love making, etc.