Yorkies are a notoriously picky breed. You have tried everything that I would have suggested. What people foods have you tried? How long do you leave a bowl of kibble out while giving her nothing else to see if she will eventually eat?
I'd be concerned that she is running away from some of it and the issue has gone on for so long. While likely just a behavioral thing, when was her last blood work? ALT, ALKP, BUN numbers? Have you ever considered bile acids testing to see how her liver is functioning? Liver compromised dogs sometimes refuse food because it makes them feel sick (and I uspose the same could be said for those with intestinal issues). Stool always formed and brown? Any vomiting?
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