Thank you all... Her vomiting had started on Sunday night, early hours of Monday so it was not 3 days of vomiting... but anyway, good news is she has stopped vomiting on Tuesday and I attribute it to diarolyte.
The lessons I have learned from this:
1- Dioralyte is important and i discovered that when mixed with her favourite juice, she did not complain about it being yukky anymore and she took it in few sips here, few sips later on there...By the evening, she had almost the whole dose in her tummy.
Wonderful. I am adamant that it made the difference.
2-)The medical opinion about what you can give your child with tummy bug varies from one doctor to the other, when nurse practitioner almost banned all traces of milk which sounded very harsh to me anyway, she specifically told me only rice, boiled potato and bread was allowed and no cheese, no smear of butter on toast, no chocolate button, no citrus fruit, etc... According to her, even apple might have been acidic and therefore bad. I understand that some of these items ie orange/citrus fruit might irritate the already-sensitive tummy but it left DD with almost nothing to eat.. the doctor I spoke to afterwards, told me nowadays they do not ban milky products as such and that she could have had cheese, pasta with some mild sauce, soups etc. So if this happens again, next time I know what to do!
3-) Ice lolly idea was brilliant, she loved it, perked up immediately with the promise of ice lolly and was happy afterwards for a long time , it was a treat, especially since being banned to put anything in her mouth that it edible, she was miserable.
4-)Thanks Belgo, for pointing out that I don't have to tell the receptionist about why we need to see the doctor. Next time I will remember that.
5-) DD thankfully loved potatoes so I bolied and mashed for her with only a pinch of salt which gave ther some energy, combined with dioralyte she was fine again.
6-) I will keep the name Rehydrat as a reference as alternative, thanks for that. I would not have thought of flat coke / lucozade etc but I will keep this in mind too.
Thanks ladies, all your replies helped. Problem is resolved for us, doc says she can go to school tomorrow and so I can go to work.