Hi there and thanks for your question. It sounds like you are doing all the right things to help your little dog.
The reason we recommend a high fiber diet for diabetic dogs is that we want their source of carbohydrates to be complex carbohydrates rather than simple ones. Fiber is a very good source of complex carbs as compared to sugar which is obviously a bad carb.
I would think that the holistic food she is on would be ok for her. However, if you wanted to add some fiber you can add 1/4 tsp bran to each meal or give her 1 tbsp of canned pumpkin once or twice a day.
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Dr. Marie.
Experienced and compassionate small animal veterinarian in a busy Ottawa practice. If my answer has helped you please click the green accept button. THANKS AND GOD BLESS YOU!