I recently bought a 1 yr. old Yorkie, I have had her for three days now and she hasn't eaten since I brought her home. I have been giving her the same kind of dog food that her previous owner was feeding her but she won't eat. What should I do?

Put a little chicken broth over the food, if that doesn't work add a little chicken with the broth.
She is probably scared and unsure, once she is eating, cut back until it's back to her normal food.

That's just my opinion and it has worked for me. 3 days seems like a long time.

She is drinking, right? If not she needs to go to the vet asap.

It could be post partum depression.
Dogs can get that too.

If the vet says there is nothing wrong with her, then she is just sad. Try to encourage her to eat, and just be there for her like a good owner would.