Makes sense, but I don't know why she would develop the habit after four years of eating food without hesitation. She hasn't had any serious illness.
I even go through the effort of changing her food bowl daily so she doesn't smell the old food. She could even eat some of the food, come back in an hour and demand I prep her food again. It's very annoying.
It's what I'm doing now. Although it's really hard sometimes. I'm frequently busy at my computer, and ignoring her means she'll walk all over my desk and stare at me for a few minutes which is very frustrating.
Obviously I'm trying not to encourage her annoying behaviors, but sometimes I don't have the time to be patient.