My sixteen year old cat suddenly decided to tear at the paper bag and the newspapers inside that we set aside for recyling. This bag has been in "her room" for years and she's never done this before ...
Mayber after all that time she got bored - cats do like to play with paper bags. Sometimes having a female spayed does not change the instinct to nest.
Try leaving a few brown shopping bags around the house to see if she will play with them. Even a carton/box with some toys in it.
Just found your answer. She never did this again. Thanks for the suggestion. :-) Otsn