Suggest Treatment For Tummy Pain And Fever

My daughter is five years old, she has had a hurt tummy and on and off fever for three days now. She has had little interest in eating but has tried, and vomited. She is thirsty and is drinking fluids. Her color is pretty good and she is talking, playing etc, even though she is low energy. My main concern is that her breath is very metallic smelling, in fact she is emitting a very metallic smell. There was some recent work on our water main and I am concerned that she there may be a metals poisoning and something more than just the flu. Should I take her to the hospital?