I think you should get together with her some more- after taking a zillion shots, she'll be more comfortable and you'll start to not notice so much that she's a pretty girl, and looking provocative (which only will rope in maybe half the viewers, mostly men), and start noticing the details of what she's doing, and why. It's tough because she IS pretty, and looks quite nice, especially scantily clad, but... that's not special. What is she thinking about? What does she care about? Are the pictures telling the viewer a story? What's that story?
Right now, the story I see is pretty girl in thin attire, doesn't know quite what to do. Is she comfortable with you, or the scene? Take pictures of her face talking about something she cares about, nothing else, in different light, so you get a sense of who she is and WHY she's unique. THEN at a different photo shoot, try the other pictures you were aiming for- they might catch something of intimacy then. It's not here. But you got everything you need to get there.
Have you done B&W of her, in just sweats? Low light? Drinking a cup of water, or smoking, or whatever she does when the camera isn't "on her"? I think you'll get some great pictures of her, and that show off what you know how to do if you start there.
Everything you say is valid, but those things aren't always possible. Louise lives a long way from me and the shoots I've done with her have been an hour or two she'd had free between shifts at work when I've been passing through her town. We've developed a good rapport but there are time limitations. With some of my local models we do much as you have suggested.