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Thanks for getting back to me so quickly. This sounds like it could be flu (H1N1), though of course I can't diagnose your daughter with anything remotely. If she looks very sick or you have concerns about dehydration (sunken eyes, dry lips, no urine for more than 8-12 hrs, etc), then please have her seen. Although it may be scary, the H1N1 is no more dangerous than regular flu at this point--maybe even less so. That being said, certain kids can get quite sick and so they should be seen. If you are seriously considering taking her to the hospital, the please do so. They may start her on the anflu medication called Tamiflu.
I hope this is helpful. I hope she is feeling better very soon. Again if you are conflicted, please be on the safe side and take her. Thank you and best wishes, Dr David