I am so sorry your little Chloe is feeling depressed. I don't know as much on this subject as some of our expert breeders. You may want to post this in the Breeders Talk section. I would think that after such a traumatic experience she would naturally feel depressed and confused. I hope you get some suggestions and that she's feeling better soon.
Btw-Congratulations on your first yorkie and Welcome to YorkieTalk!