Hey girls bit late in to this thread but thought I'd mention it anyway as might help others who get gastro. Oftentimes after a bout of gastro kids (don't know about adults) can develop temporary lactose intolerance so if your DD was say still having milk at night before she went to bed it could cause her to vomit again rather than the bug still being around. Learnt this the hard way when DS was much younger. When re-introducing milk i always watered it down.