You know how someone can be touching you, stroking your arm or whatever, and the moment it turns sexual you can tell? That's what I would do, in your situation. Touch her, stroke her, perhaps not touching her squeezy bits, but touching her in a sexy way, nonetheless. Maybe a "I think you're beautiful" or whatever strikes you. Let her know that YOU are thinking of her sexually and whatever she may be thinking is her biz.
I think the general idea is to act on your own sexual impulses instead of putting a lid on it cause she doesn't want you to. That doesn't mean throwin yourself at her..it means reaching out to her and touching her and talking to her in a sexual way. Lightly but definitely sexy.
But........like I said, I am a dyed in the wool HD gal and I don't think I've ever felt pressured re: sex in my life. So take what I say with a block o salt.