This is a tough situation and seems to only be getting more difficult to maneuver. I would start working on the approval for Biopsy as soon as you know who the doctor is, because the truth is that corrective measures won’t start until the biopsy results are back. The delays in getting treatment can be very frustrating.
Try to be patient with the doctors, and nurses, they are all having staffing issues now. Also it makes it easier, when you ask them to help you get things pre-approved in time. You know, the grumpy people are less likely to get favors. I have always felt this was a problem, but I know over the last year things it has gotten harder and harder for clinics to stay on schedule.
I am praying that you will be able to navigate this and get the best treatments going as soon as is possible, for whatever type of cancer your wife has.
Did your oncologist tell you what type of doctor would be doing the biopsy? Did you get the referral for that yet, or do you have to wait for the PET ?