Somebody shoot me, please.

I care for my husband's elderly mother who lives with us, and lately she's been doing poorly. It started with an infection (cellulitis) in her left foot. Antibiotics cleared that up in about a week and then she came down with a really mean chest cold. I believe in "feed a cold, starve a fever", so I have been trying to get her to eat for 5 days now. I have succeeded in getting very little food and even less liquid into her because she has, in her own words, decided to starve herself to death. Dave got her to eat breakfast this morning, and she has been sipping on the same Coke most of the day. In the meantime, she has lost control of her bladder and other nether processes and refuses to go to the doctor. If she continues this way, she will end up in the hospital.
Except... I went into her room to change her sheets and there were several candy wrappers stashed around her chair. I found a bag of chips in her magazine rack. We heard her in the kitchen making a cup of tea last night. Sigh.
I am reading a book now entitled "Emotional Blackmail". I think I am living with a master.