I know she's old, I'm trying to be sympathetic but I cant stand it! She's ok in herself, eating grooming etc, bit stiff but that's about it. She started doing it when we had builders in so we thought it was just the disruption, but she's done it at least once a week for a couple of months now including on various beds 
She's got a cat flap and still goes out.
Please tell me I can do something about it! I'm really conscious that she's not got many years left and I don't want to spend them being cross at her! Disclaimer: I am nice to her, honest!