Thank you so much for your inputs. I'm happy to tell you that Missy is eating more now, and she is racing after a ball whenever I throw it. I bought some other food (Perfect Fit) and mixed with her KitKat - it seems she prefer that, judging from what kind is left in the bowl. She is also interested in licking tap water and she has been drinking from a glass I put in the bathroom. All in all she appears to be happy and healthy.