Cameron's at home, she's got dinner in the oven and she's swishing a duster around the top of the piano - wouldn't want it to get dirty. The duster may swish over a few other pieces of furniture around the place, but for now, just this.
To see her through the front window, she probably appears a bit dazed or like she's in a dreamland somewhere. She's thinking. Her mind wandering off to somewhere else, it should be back soon.