What Causes Fever And Watery Eyes In A Child?

Hi, my daughter is almost 2 1/2 years old. We were out this afternoon for about an hour and half and part way through she started getting kind of whiney - not her usual self. She didn t sweat today like she usually does, even though she had plenty of fluids. She became very clingy too. Her eyes started watering and I thought is was maybe just the sunscreen bothering her. She hasn t had much of an appetite, so I took her temp and it is 102. I gave her tylenol about an hour ago and we took a tepid shower. She is more comfortable, but still has a temp of 102. Is this heat exhaustion? What else should I watch for / what else can I do to keep her comfortable?