Hello,
Neutrophilia (elevated neutrophils), elevated liver enzymes, and vomiting, can be consistent with a pyometra. Usually dogs with pyometra (or stump pyometra) have mild anemia, increased urination and increased drinking, which your dog does not have, but your dog does have other signs. Your dog has elevated red blood cells and elevated albumen. These elevations are due to dehydration, which can have many causes, including pyometra. The pus in the abdomen can be serious. Did your vet take the sample directly from the abdomen, or did the vet sample vaginal secretions? If it is from the vagina it is not as reliable.
I do not have a yes or no answer for you. I believe that your veterinarian is going in the right direction. But you can request more diagnostic procedures to be more definitive, such as abdominal X-Rays and/or abdominal ultrasound. An abdominal ultrasound is a very effective diagnostic tool in this case and would be worth the extra expense.
You could also have a second opinion with another local veterinarian, or go directly to a veterinary referral center, where a board certified soft tissue surgeon and internist could see your dog.
Your present veterinarian should not be offended by your seeking a second opinion, since it is done all the time.
Lastly, your dog’s relatively young age is in her favor. She would probably make a good surgical candidate. Just be sure you have all the requested presurgical blood work, urinalysis, Chest and Abdominal X-Ray and an ECG prior to the surgery. I would also make sure your dog has IV fluids before and during the surgery. You would not want to personally go through a surgery with out a pre-surgical work-up and IV fluids. The more information your veterinarian has going into the surgery the better the outcome.
Good luck and please let me know if I can help further!
Dr. Cheng