Oh no!!! you need to keep your spirits up!!
Something you will need to keep in mind is that yorkies are pretty emotional and are stressed VERY EASILY moreover finnicky eaters! With that said any changes such as: new home, travel or even weather changes could trigger your baby becoming ill. My Nella had similar issues when we first brought her home. The vet said she had a parasitic type of infection. She received antibiotics and she recovered shortly after she began the treatment.
You may also want to look at an intersinal parasite called Coccidia- very common in little Yorkie pups (something that our breeder told us to monitor closely). You didn't mention her stool was bloody (which is a great thing!!) but something to look at is a further reading for you about Coccidia:
Intestinal Parasite (Coccidia) in Dogs | petMD
Blend foods to consider giving her: broiled lean chicken breast -no seasoning, and cooked white rice (this combo is always my 1st) baby food: yams, canned low sodium pumpkin is good for stopping diarrhea too.
Good luck!
Keeping your little one in my prayers. Keep us all posted.