I'm not sure why you are afraid to give her chicken if she isn't allergic to it. A lot of the recipes for liver compromised dogs, including the one Lady is on, call for chicken. Fish and chicken produce a little more ammonia than protein from dairy products, but are still fine to feed.
Have I posted this for you before? We have had so many new members with possible liver disease dogs lately I can't keep them straight.
Liver | B-Naturals.Com Newsletter