I'm so sorry to hear about your baby. I hope whatever she has ends up being treatable.
I'm not sure where you are in Georgia, but a GREAT specialty vet near Atlanta is Georgia Veterinary Specialists (located just a few exits up 400) in the Sandy Springs area. They brought my bullmastiff back to life twice and treated him for his lymphoma. They truly are miracle workers. I don't know anything about your vet, but my bullmastiff had just had his annual check-up and given a clean bill of health. Not even two weeks later we were in the ER at GVS and given his cancer diagnosis...it just goes to show that even good vets can miss things.
Check them out if you are interested:
Georgia Veterinary Specialists