To be honest we had been advised of the possibility of Cancer before, and we had considered whether to go down the ultrasound route. However, it is a three hour journey from where we live to a vet, including two ferry journeys, and at age 11 we were in doubt whether we would want to put her through an operation (if it were cancer) or whether she would be strong enough to survive it. We came to the conclusion that as our own vet said that the test results were very severe, that the best course of action would be to try and help her live her life to the full until the time when she was in severe discomfort. Hence the reason that we want her to eat, but we are struggling to get something that she will actually eat for more than 1 meal.
Thank you for the information, you have been most helpful.