One idea that was posted here a while back is to get an inexpensive plain smooth cover and buy a skin from DecalGirl.com (there are skins for every taste, including geeky). The skin for the bezel can be used or not, as desired, and the part for the back of the ereader can instead be put onto the cover. If she gets bored with it the skin can be removed without damaging the case at all.
There are a few pictures in this thread --
https://www.mobileread.com/forums/sho...t=decal&page=6