My 11 Year Old Granddaughter Came Home From A Sleepover

My 11 year old granddaughter came home from a sleepover today and is complaining of: jaw pain, especially when she yawns, her chest hurts (she said it's not burning or bruse like, but can't explain it), she feels nausea, has a headache and is tired. Please note that she's recouperating from diahrea for the last few days.