I'm the same way, I never run the kids to the doctor unless symptoms last awhile. But a couple weeks ago when my 12 yo. came home ago with a fever and cough, I had him at the doctor the next morning for a flu test. With everything going on, I don't think there's anything wrong with taking your DD in today for the same. If she tests positive she can get Tamiflu and get better faster. And maybe they can also give you Tamiflu for the rest of the family so no one else gets sick.
BTW, my son tested negative, but there are a fair amount of false negatives with the test, and based on his symptoms, and his sister's, and mine (ugh!), compared to others I've talked to, it's highly likely we had H1N1. Their symptoms were worse than mine - high fever for 2-3 days, cough, sore throat, then the fever and cough starts to taper off, they start to feel better, then get hit with a nasty head cold - watery eyes, sneezing, congestion, etc. Assuming your DD has it, without Tamiflu you can probably count on her being down for at least 4-5 days.
Good luck, I hope she gets better soon.
Edited 10/24/2009 8:40 am ET by snowbabies97_98