Poppy came in this morning. I chased her out. Then I remembered that I had had an idea to try and resolve it,
I armed myself. With an umbrella.
The next time she came in, about half an hour later, I went in to the kitchen umbrella first. I was opening and closing the umbrella as fast as I could. She shrieked, and ran out.
I'm pretty sure the call of the cat food will overcome her fear, so I the umbrella is on the sofa, all ready to go.