I put a link to this thread over in the breeder section.
Is there any way you can get her in to the vets before the 26th? 9 days seems way too far off, especially if she is possibly going to whelp on the 28th.
I'm just angry beyond words that anyone would sell a yorkie they thought might be whelping!!! Talk about being freakin irresponsible.
If the 26th is the soonest this particular vet can see her, you need to find another. I know there are multiple members here in PA. Maybe they can point you in the right direction.