She wont eat liver! Shes fine with bones, skin, heart etc, but she wont touch the liver. I started off with the other stuff cut up in small pieces in her favorite wet food, and it worked well each time after a few days, but not the liver. Ive picked out most of the liver so theres only a few very small thin scraps but she still wont touch any of the food and hasnt eaten all day. How important is liver? What to do?