I think she's just trying to make it more comfortable but isn't really doing a great job with it . Tiki does it a lot too. She'll dig at the carpet on the sofa, which usually ends with the unsatisfying result of the carpet falling on the floor and totally ruins her chance of creating that perfect sleeping spot. After that she’ll start to stare at me and won’t quit until I pick up the carpet and place it in a manner which suits her. :P Silly dog.

-Varga