I think it means your current state to access that particular "undressness" state of her, meaning, if you haven't advanced into the story with her or your sneaking fu isn't good enough, you don't get to see her in all detail, have to play the game to get further, increase skills and her particular questline
at least that is how I understand it, because when she is clothed in other areas of the house, and you look at this same info window, then the image is of her in that particular attire and not pixelated