Communication can be tough under any circumstances and from what you describe things are going well. Do you want to sprinkle in some entertainment like a movie or concert? It would take some of the pressure off talking a lot and let you express ideas about a third person or stimulus.

If its not awkward you could see something sexy or scary. That's an old trick by straight guys to make a move. Anyway it might lead to talk about feelings you could say, You know I have these feelings for you and want to express them/You turn me on...

Everyone LIKES feeling they arouse feelings in others even if they are unsure of their own feelings. Even if they dont like the person, which in this situation you know she likes you so flattering her by announcing sincere attraction may work.