Casey Nocket has traveled around the western US vandalizing National Parks and National Monuments with her "art." She has acknowledged that she is not in the right only in regards to her use of acrylic paints, she responded to a question about her paint materials on Instagram with the comment "I know, I'm a bad person."
http://goo.gl/63QDQ2
The preceding link is to an article about her trip through the western US where she did her work. It can be seen that she vandalize these locations and in some cases climbed across protected historical works. Furthermore, it should be noted that plenty of people on within her social network seem to be of the opinion that this isn't wrong.
Please don't allow her to receive a slap. Please pursue the most serious of charges for these offenses.