Hey~
Sorry i've been MIA- lots going on.
I'll try to help as much as possible...
NC.
Give your baby the Tamiflu, make sure she eats something and give her a dose of Tylenol for the headache. 99.4 is not high at all for a fever and usually you would see an immediate spike really high with chills, body aches, etc if its the flu. Hits you hard and fast. She should be covered with the Tamiflu for a bit.
Keep a watch on her tonight. If the fever is gonna spike it will be tonight. Any chest congestion? You get that too with the flu.
If tomorrow she isn't any better, take her in to the Ped and make them run a flu test.
I hope she is feeling better soon.
Let me know if you need anything else...
Jo