In the meantime, I've been getting her down from our fence with a wash-basket. What is it with wash-baskets? Every cat I've known has loved them. They're good for sitting, fighting, playing and sleeping in. Penny finds our one almost compulsive, so I hold it up to the fence and she jumps in. Three times so far this morning. The back door is now closed. She can't yet work the cat-flap, but that is also just a matter of time.