I think it is okay to do what is needed to care for the body, but we do encourage you to tell her about it when you can, with very specific information. For instance: the body has been getting dizzy upon standing, and feeling very weak. It needed some protein and iron, so we ate 1/2 a roast beef sandwich today. Or: the body has had lots of muscle twitches and cramps lately. It needs some calcium and potassium, so today we had 3/4 cup cereal with 1/3 cup milk and 1/2 banana to make us feel better physically. You're right, she might get mad, but if you can explain the specific reasons it should help facilitate communication and understanding.
~Emma