She's found!!! Alive and well the sh#te and causing mayhem in someone's garden so I was told (so much for my powers of vision!)
Facing the owner was not something I was looking forward to so I was glad to find her in the driveway of this very grand, very posh house having a quiet snooze under some trees and nipped her around the corner sharpish.
I'm sorry to say that, if caught, I was going to give a false name (Cynthia Rowbottom) and say her owner was ill and I was collecting her on their behalf. It was very hot and I had a mile to walk her( which took me an hour and forty minutes!) though I will call in and ask about any damage, she's not normally a havoc-causing pig but may have got into their veg garden.
But, where has she been all this time? One thing she was very nervous, almost frightened. This a pig who has never known a minute's harshness and responds to a slap on the bum with "I'll go when I'm ready" squealed and took off at a run at a tap with a carrier bag of apples!
Thank you all for you concern. It buoyed me up.