If Emma has a shunt or MVD, a high protein food like Evo will not work for her. She needs a food with no more than about 22% protein if she has no symptoms, less if she is symptomatic. Animal proteins produce ammonia which gets into the system of a liver compromised dog. Red meat is the worst and should be avoided.
This is a great article about nutrition for dogs with liver disease:
Liver | B-Naturals.Com Newsletter
There a a couple of excellent premium foods on the market that are low protein and may work for Emma:
Holistique Blendz Adult Dog (fish) WELLNESSŪ - Healthy Dog and Cat Food