[Maximo]

I agree that going such a long time without a bath might be why you are seeing the hair come out. Yorkies are like humans (young humans) and they will break hair.

I would brush/comb every day and give her another bath in a week. If you still see a lot of the hair, I would take her to see the vet.

I would also avoid going that long without a bath in the future for fear that it would cause skin and hair problems, infections.