One of the best things you can do is get away from the walls. There is a natural tendency to get close to interact with them, I do it ALL the time, but in reality we don't want to see models interacting with walls.
Pull her away and learn to work in ways that don't involve these subconsciously inane gestures that we don't relate with any particular emotion. Granted, there are exceptions, like, "the cool guy" leaning against a wall, and other things of this nature. Gentle portraiture though, is best when you can vary between both distances to the environment.