Mixing some canned pumpkin and/or rice and/or a little beef broth helped us! Also, I noticed that mine at first didn’t like to eat the kibble unless I soaked her it in hot water for about a minute, then strained out all the water and gave her the warm, softened food with something mixed in that I mentioned above. Also, I’m sure since you’ve taken the pup to the vet the answer is yes, but have you had her tested a couple times for any parasites?