Thanks everyone. The vet said that surgery is the only thing he can think of and he did not give me a quote, because it is an exotic animal and he won't know how long it will take, how much anaesthesia, etc.
She is actually looking better than yesterday, more alert and active, but the ball hasn't moved. I have been giving her very warm baths, and her tummy does get soft, and I have been trying to give her olive oil in mashed bananas (thanks for the tip) but not very successfully. I'm about to try giving it to her with a syringe. She doesn't seem to be bothered when I gently move the ball in her belly, trying to dislodge it if it is stuck.
I greatly appreciate the comments and support.