Saige and the crayons

See...this is what my child does. She eats crayons. I've basicly given up. I tell her to stop but she continues to eat them. She will sneak off and nibble on one. GROSS!! I can't leave crayons out or she will bite the tips off of each one. Its so so gross. And its just as gross coming out the other end. We had to have her iron tested to make sure she didn't have pica. She doesn't. She just eats them.