For the past few days, I leave the food within her reach and she will sometimes eat a little of it, but her intake has been only about a third of what is normal for her. She is angry because I won't let her 'go home' (as if I could) and won't speak to me, either. When I'm out of the room she rants and raves about what a horrible person I am, but clams up when I try to talk to her. She doesn't seem weakened at this point, but I'm worried; how long can she do this without harming herself?