I believe that AZ is one of the more expensive places to get a necropsy. CA, on the other hand is under $30. If you live close enough to take the bird in personally rather than ship, it is less. Most people don’t have necropsies done, unfortunately, but some may if there are future deaths from...
It would be best if you could contact your state vet lab to find how to send her body to them for a necropsy. Then you could find out if it was really Mareks or something else. It is possible to still get Mareks even when one is vaccinated. But so many other things may look like symptoms of...