For what it's worth, I managed inventory/purchaing for a multimillion dollar animal hospital for a number of years. The worst for foreign bodies were labs, goldens, and german sheppards believe it or not. Our worst offender was a Chicago Police Sheppard that kept eating the handler's kid's pacifiers. Bigkat650 mentioned that "possibly the stomach has flipped". That's called bloat in the bizz and for good reason. The abdomen is bloated, because the stomach is twisted, and is a super serious and very life threatening problem that almost always requires surgery. I say almost because on the rare occasion, the stomach can be massaged back into working order. All that said, your vet did what vets should so. X-rays first, and while those are being run, do a fecal and draw blood. Glad to hear that's treatable and you're on the right track. Give your girl some extra love.