When my old blind kitty, Pixar, had cancer she lived about two weeks after the diagnosis. She was very similar to Isis, in some ways - she was happy and cuddly and as obnoxious as ever, but she wouldn't eat or drink enough. I started giving her wet food with added water or broth just so she could eat something until the spunk started to fade. (I also found out that when nothing else was interesting, she would still sneak up to my sub sandwiches from wawa and scarf down the turkey when she thought I wasn't looking. So funny.) She let me know when she had given up and we enjoyed another hour or so of sitting outside listening to birds before I wrapped her in her favorite blanket and we went to the vet.

I hope you can enjoy the time you have left - Isis is lucky to have you as a mom.