When I had the flu last year, I did run a low fever, and was sweaty--as were others I knew who had that strain of the flu then. Since your daughter doesn't have a fever, please call her Dr., just to be on the safe side.
I forgot to mention that she is on meds (since thursday), I did take her to the dr. I haven't called because it was the urgent care dr. I was just curious about the night sweats but last night she finally slept through the night without coughing and being restless so I think we're in the clear.