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Thanks for your response, chanel5 - the only one that's come up so far.
Yes, it had occurred to me that might be the case with using an ultrasonic dog whistle to try and control the howling. Obviously I don't want to stress her out any more than she already appears to be, for whatever reason. And it did seem to be the case that she may have suffered neglect or abuse in her previous homes, which could well have left permanent emotional scars, but she had no evidence of any physical injuries, and purred readily. Sadly, it may be the case that she will never forget, even though she gets food, affection and security from me that she may never have enjoyed before, and even scrambles into bed with me and purrs contentedly - although she crawls out again after about 5 minutes, and sleeps at my feet for the rest of the night (even though she risks occasionally getting kicked when dreaming causes me to have involuntary reflexes!)
I even changed her name from Fudge (!! - she's not brown!) to Wendy, to disassociate her from any unfortunate memories the name might hold for her..
As for your suggestion of using Feliway - I'd forgotten that we did actually try this when I took her to the Blue Cross. We used about 3 of the little plug-in devices over a few months, to zero effect (although it's possible it may have contributed to keeping the little trio reasonably harmonious). Their behaviour was not noticeably better or worse when the plug-ins ran out, so I abandoned them.
Anyway, thanks for your suggestions - I guess I'm just going to have to put up with it (and I sometimes wonder what the neighbours might think I'm doing to her, as they must be able to hear the howling - it's almost like a wild dog or a wolf, and sounds terribly mournful). At least she has come to the end of the road with me - she's here for the rest of her life, and I won't be offloading her on to anybody else. I just wish I could do something more for her.
PS: In case anybody else feels like chipping in, I should also have mentioned that there are no noisy children or any other people around, the flat is largely quiet, unless the TV, radio or music are on, never loud, and there are no other animals nearby, other than the cats which live in the houses either side, and she appears not to have any issues with them. There are dim orange lights on all night long, and she comes and goes through the cat flap as she wishes, and is never pursued or challenged going through it - to the best of my knowledge. She never seems to desire to hide in dark, inaccessible corners, and is quite content, like most cats, to peacefully snooze most of her life away! To all outward appearances, therefore, a normal and well-balanced cat.