If you are wanting to test to see if she qualifies for antiviral medication, the CDC recommendations are to treat within the first 48 hours of symptoms, unless there are special risk factors. That is because Tamiflu/Oseltamivir inhibits the replication of the virus, and given the sharp exponential upswing of viral replication within the first 48 hours, you typically don't get much benefit after that.
The exception is that the treatment can prevent the more dangerous sequelae in those with risk factors (asthma, heart disease, <2yrs old (IIRC), etc) even after 48 hours, but it doesn't help much for others at that point.
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