Why?

Addie has always put everything in her mouth (my sister's ring for instance). I thought it would end when she was done crawling. Nope. Maybe after being a toddler? Nope. In fact she still chews on most things, but we have a new development. She has moved up... to her nose. Why is it a good idea to put skittles in the nose? Why is it a good idea to stick lots and lots of tiny pieces of toilet paper in there? Why would you try to see if pop beads fit? I don't understand and am at a loss at how to make it stop.