I agree with Madusa
Your better off finding a new friend with more feelings toward life.
Or...you can sit down with her and have a long kind chat with her about how important it is to care for an older cat just like it is your grandparents.
The older/sicker cats need us the most.Of course kittens are super fragile and need extra care but she needs a good learning conversation.
Teach her how important cats need daily water so they don't get dehydrated and die and so on.