What Causes Joint Pain,sore Throat And Fever?

Last night my daughter started to feel deep aches in her joints and a sore throat She bought some cold medicine but called me at 4 am literally crying that she had a fever chills pain in her back pins and needles feeling deep in skin. She even got in the bathtub to try and bring down the fever. I told her to take 2 Tylenol at 6 am after the original medication time lapsed. She did and did not go to work and fell back to sleep. I checked to see how she was around 1030 or so and she was just beside herself with the pain chills and this restless pins and needles pain. I live an hr away so I drove here and she was very warm. She took 2 more Tylenol style noon. It is now 445 and no relief. Is this the flu can she take 2 more extra strength Tylenol now? Not sure what to do as she normally never complains