K.P.
There is a virus that goes around in the warm months..summer and early fall. I can't remember what it's called? It causes these exact same symptoms. My son has had it a few times. Usually we develop an immunity to it as children and don't get it as adults. It causes a very sore throat (even lesions on the throat), fever and nausea/vomiting/diarrhea (usually that part only lasts less than a day). I'm no doctor, but I do also know that many strep tests have false negatives. I would say wait a day, and if the fever/tummy troubles persist tommorrow then take her in. Strep absolutely causes vomiting, but I don't think it causes diarrhea?