As the mother of a child who has had many stomach viruses, I would head towards port and see what happens. The limo is already paid for, and I would give it as much time as possible. As PP said, most stomach viruses don't last long, and she probably is at the end of it. Though they feel weak initially, they usually snap back pretty quickly once they start eating again. If she is no longer vomiting, she probably isn't contagious any more. If she is vomiting, then you have your answer. Praying for you all, let us know what happens!! Never mind...I see now that you are contagious for a few days to weeks afterward, so canceling is best. Was hoping for the best for you!!!