Did the vet that examined her say she was in good health? If so, I would stay with the same brand. What did the veterinarian recommend? You can leave him a message for him to call you when he has a minute and see what dog food he suggests.
My small breeds like Nutrisca dry foods. Check Chewy.com for reviews. I have never tried Blue Wilderness. The Nutrisca is a small kibble so I find the little ones do well on it.
Hope this helps:
https://www.mspca.org/angell_services/choosing-the-right-diet-for-your-pet/
http://skeptvet.com/Blog/ see blogs on nutrition
