The Facebook opener is "Do you remember who I am?". Most of the time they respond. It is my best opener.

And I have a question. I was talking with a girl on Facebook (I don't remember the opener but it wasn't this one). Se realized that I was interested in her, and ever since she did not replied to me. Her last message to me was "I don't know who you are :S". Then I've send her a fiend request but still she is not responding. Do you have any ideas what should I do? My current plan is to become friends with her friends on Facebook so that she will get used to me, may be not. I have higher vale than her, if only it was possible to met her somewhere in coffee or something like that...