Thanks CC. Have just been reading up on many things in the last hour, including Pat Coleby. I do like her advice and always worth a try when nothing else works... In my panic I took her straight back to the vets and they have kept her in and they will not be feeding cider vinegar tonight... I also know about the bicarb, oil and yoghurt mixture that has helped many other here, but as she was in such a bad way I didn't think I had time to try that first, but maybe I should have...
Have also been reading about emaciating sheep diseases here and elsewhere, and I' having the awful feeling it might be Johne's...
The picture fits rather well... slow emaciation while remaining bright and eating well, poor fleece (definitely in her case) and puffy cheeks (she has had that on occasion, coming and going, hence the fluke treatment which didn't help).
Vet mentioned this as a possiblity though said testing for it is very inconclusive. However I seem to be reading that a test is available. Anybody here has tested their sheep for Johne's?