Well, you know that you can't rush her. So the obvious thing to do is hang on in there. If you have to wait for her, it probably will take time. And if she does decide that she wants to be more than friends, then surely, it'll be worth the wait?
I know its terrible waiting for someone to decide about whether they want to be friends or more, but it means sooo much more if they do decide that they want to be closer (especially after some time). To girls, sometimes this decision does take some thought.
(I hope this is kinda making sense. Sorry if this isn't.)
Yet again, i have to go...
Just hang on in there GGC. I'm sure she'll let you know, when she's ready.