I've been here a VERY long time, almost 6.5 years!
Make sure to comment on her opinions, and to answer her questions, to display that you are into what she has said, vs just being into her because she's cute.
You will be SHOCKED how many messages from guys any female user is constantly bombarded with. When u get better acquainted with some female GaGers here, ask them about stories about the messages that guy send them. You will be surprised. :-P
Check out her profile in case she's taken. It may not say anything as it may be private. If she asks a question, reply in a reasonable way, but add a bit of homour sometimes. Get to know her slowly, then follow her and see if the accepts and follows back.
I don't think much will happen, although MAGIC things have happened here!