I can’t imagine her NOT trying to find some way to cheat.
Electronic-paper display would be a possibility. Presents as a pale colored perfectly blank surface on which characters can be displayed; and, is reliant on reflected light just like reading a magazine. When not in use, appearance can be blank or mimic surfaces of common items to blend.
http://www.tomshardware.com/news/LG-Display-E-Paper-Skiff-Flexible,9443.html