Inadvertently she came up with a brilliant way to super-copyright her work. She had a sheet of postage stamps made of one of the pieces ($20 online). It is easy to do on Yahoo Photos. And now she has mailed a few of the stamps to friends.
Just like the early days of patents when inventors mailed an idea to a friend who was told not to open the envelop, the letter became a Post Office official confirmation of the date of first use or first development.
Now we have stamps with a postmark right next to it as an official timestamp stamp.