Hi Nay - I think you're absolutely right - if your mum wants to eat ice cream and it makes her happy, why not. She probably ate her vegies first most of her life and thinks what good did that do, and now she probably finds it easier to eat ice cream anyway. If she wants to have her cake and eat it too - that's possible - just get more cake (or ice cream). Giving your mum meds to make her hungry shouldn't have been a decision the nurses made on their own without consulting you and your mother's doctor.
I think it's similar to the story about the HD woman who was happy to be in a wheel chair so she could still wear her high heels - red stilettos - wow - how many people in wheel chairs do you see in red high heels - much better than boring slippers if she preferred her heels.
With regard to your mum I'd be mad as hell
Let her eat ice cream, as Marie Antoinette would say.
sonnie xx