if you have to make her fall for you then maybe you're just not right for each other. that is a possibility. but if you really love her just wait a while.
as for me and my boyfriend, i fell for him as soon as i saw him, i just didn't know it. he was terrified of me rejecting him and then when we did get together my depression took hold and i broke his heart by breaking up with him........
but then over a long time my brother made me see sense and a year later i told him that i couldn't live without him and i honestly believe that when he agreed to give it another go he saved my life.
i wanted to die every day, but thanks to his love and support my depression is under controll and the last 4 years with him have been the happiest of my life. :)
so maybe a girl just needs time to realise how she feels, with a little help from friends and family, and a little patience from you along the way.
the best things come to those who wait and it will be all the better for your patience. trust me lol.