If it was my girl I would wait I just had a litter at 66 days after the last breeding.
If you are concerned take her in for a check but they will eventually go into labor when their body and the pups are ready.
An automatic section for 64 days and he has not even seen her
That would be a no for me and I would go with the other vet.
If she is distressed, fever , or just not herself then take her in otherwise I would wait.