I agree with the idea of Pedialyte, it will at least make sure she's not dehydrated and give her a bit of energy and should be gentle on the stomach. If she's dehydrated she will only feel worse and not want to eat.
Also, instead of tomato soup, I would try chicken broth (MSG free) with a bit of rice and cooked carrots in it. Thats what I eat when I'm really sick.
I would stay away from meal replacement drinks, I've never been able to tolerate them on a good day. Try instead just getting her to eat a bit more often.
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Re: Advice DESPERATELY needed - to help my nan put on weight fast
