A vet should never shrug off bad breath of this degree without checking for the mentioned diseases. A veterinarian should perform a test to check liver enzyme levels (for the liver) and creatinine levels (for the kidneys).
To recap: If your Pomeranian has not had a professional dental
cleaning have one done immediately. Over 60% of dogs over the age of 3 have some level of periodontal disease.
When left untreated, the infection will then spread to other areas of the body. If your Pom's vet has not checked for cancer, liver or kidney disease, find a new vet! Her life may be at stake.
If your Pom's vet did not recommend a prescription for Chlorhexidine, you really need to find a new vet and have this given to you; it will be spayed into your Pomeranian's mouth twice per day.
We are very confident that a new, experienced veterinarian will find the cause of this and that this problem began in her teeth and no matter where the infection may have traveled, will be able to be treated with the above mentioned tests and treatments that will be done.
Once the cause is found and treated, there are steps you can then take to keep her breath smelling nice. Aside from a good daily brushing with dog tooth paste, you should brush her teeth twice per day with a watered down baking soda paste. Hard dog treats will help scrap off plague. Sticking to a healthy diet will help keep her teeth healthy as well.