Hi. I'm not sure why your vet would say it's normal behavior, I can see a day maybe even 2 at the most of a loss of appetite after a vaccine, but not a week
It's great that you went back and had some tests run and that she's otherwise acting normal (you can most likely rule out a vaccine reaction them). I'd say lay off the Nutrical - it's definatly great for warding of hypoglycemia (spell?) but it can also make them not want to eat because the sugar content is so high, it can make them feel "full".
I'd completely stop the Nutrical and keep trying to get her to eat food. If she still won't, I'd go see a different vet. Good luck
