"She was almost hospitalised on Xmas Eve." Thank goodness it was only almost, eh?
DD is only 22 months and has already been hospitalised 4 times. 'Luckily' only one of these was for vomiting, and that was caused by a reaction to an antibiotic, not a bug.
If someone had gone against the clearly laid down guidelines/rules with a vomiting child and so DD had become needlessly poorly requiring another visit to hospital, I would be cross. I realise not every child needs hospitalisation for vomiting bugs (and probably DD won't every time) but all children (and most parents) find vomiting and diarrhoea unpleasant and distressing.
The other 3 hospitalisations were for wheezing caused by a cold. Frustrating, yes, but for most children a cold is not so serious and unpleasant as vomiting, so going out and about with a cold isn't such a problem.
I think the issue here is that you came on to this thread looking for vindication, and people have pointed out that you were wrong and you don't like it. If a child has been sick, please keep them off for at least 24 hours if you refuse to follow the 48 hour guidelines.
And a word of advice - don't think that by stating that your DD was 'almost' hospitalised that that puts you in the same boat as people who have sat by their children's bedsides wondering if they will pull through because of a 'normal' winter bug. I realise near-hospitalisation for someone who hasn't experienced this is scary and serious, but it really isn't the same experience.