Wet nappies (or not)

DD has been unwell this past week and two days ago was diagnosed with an upper respiratory tract infection, she also has enlarged tonsils and an ear infection (all related). Anyway, she has been a little off food and not drinking as much (still drinking a fairly reasonable amount), the last two nights she has had a fairly dry nappies, but during the day hasn't been too bad. Yesterday she drank 3/4 of a cup of water - she has those big nouvy straw bottles, she didn't have too much at her last bottle of the day (only 80mls as she had 200mls at 4pm as she slept more yesterday).

She is on antibiotics for the infection - should I take her back to the doctor - also she is sweating a lot (no temp though).

Thoughts?