[Blackmane]

Do something cute and charming like buy a couple roses and leave them in places where she will find them, like on a doorstep or on a car. You can even leave little notes on their saying things like I love you, or whatnot.

You can even use that for buildup to something that you have planned to do. It doesn't have to be incredible either, like jeepnuts slave said. You just have to get her anxious for it.