So Miss Nibbles is now getting into wanting to dig out all her litter in her box and throw is all over her cage! I had to tie down her litter box so she wouldn't tip it over, but she now digs it out! Its not like its dirty for long times. I clean it out and change it twice a day as she poops and pees in it all the time! I rarely see poop pellets anywhere else in her kennel/cage anymore. Any suggestions to get her to stop this or is this just an instinct thing for them to just dig!?