I've just caught up with this thread, so sorry to hear about your little girl, I hope as I write this she's getting some strength back and starting to pick up a bit.
You must be very tired and worried, try to make sure you look after yourself as well because you're the most important person in her world and she'll need you to be well too. It's easy to put yourself on the back burner and forget your own needs, try to make time to eat well if nothing else or you'll become run down as well. The dogs won't mind what you look like but they need you to be well.
It made me wonder if dogs get Coeliac Disease as well as people, I know some dogs are on gluten free foods but I guess the biopsies would show it anyway if the villi are flattened. It's an auto immune disease with the same symptoms but easier to control than the other possible diagnosis.
Hope all goes well and she feels better soon.
Edited to add - Nicola we posted at the same time, good to hear your OH is looking after you as well x