Just got back to the house from honeymoon (watch out for a mega post on that topic in the next week) to find that the cat a) had remembered that she gets fed in this house b) had worked out that it was possible to use the catflap when there are no people in the house and c) had the common sense to come in out of the cold when it was below freezing outside. Yet to find any stained furnishings, but given that she was locked out of all rooms bar the kitchen/dining room, I very much doubt that even she could cause much damage. Hurrah for the cat!
Maybe we should reevaluate her IQ towards the double digit region now?