Frustrated...what's for dinner...

So tonight Sassy's mom is a guest writer on her blog...I am so frustrated. I only want to do what is best for our girl. I can't seem to get her food figured out. Prior to her hemangioscaroma diagnosis she ate Taste of The Wild Salmon. When she was diagnosed it was suggested cancer dogs should be on a high protein diet. I tried canned food made for dogs with cancer and Sass didn't jive with this single source protein food. I returned what wasn't eaten and started her on Stella & Chewey Freeze dried lamb, she quickly adjusted to this food. And I'd like to mention these aren't inexpensive foods that we're sampling. However, after her surgery to remove the tumor and her last blood test it was recommended we start a lower protein food due to the that fact that she now only has one kidney. I wanted to follow directions to the T and it was recommend a diet with 10 to 15% or less protein. I found this hard to locate in a good brand food, there was a raw diet that registered at 15% protein and I've read good things online about dogs with cancer and raw diets. I finally got the mixture down, half a patty twice a day with some green beans and Sass was a happy camper. And today I learn....No raw diets, it's not appropriate for chemo patients. And The AVMA website has posted a statement against raw diets for dogs. What the heck am I suppose to feed my girl, low protein, low carbs, but with high quality nutrients for her?!?!?! I feel like I can't win and have lots of half bags or packages of high end/pricey food sitting around our house or freezer. I'm OPEN to suggestions on what you feed your dogs and your experiences especially with cancer dogs or dogs with one kidney. I want to be sure Sassy is given the best during these important months while she undergoes chemotherapy. I also know there isn't a cure to what she has, so I want her to be happy with her food and enjoy meal times. Tonight I feel like I'm not getting it right and hope to soon be able to find the happy medium for feeding time.