Awwwww...that poor dear. I hope she feels better soon.
Not sure what your set up is but the usual aids are:
Fans, fans, fans (some add AC - I have both, a huge relief when I'm at work and the weather is despicably hot and humid - I worry so much less)
Cold water available at all times (blocks...
As mentioned above, get electroltyes into her. In a pinch you can use Pedialtye or Gatorade. See if she'll consider cold watermelon with either of these things spritzed onto the fruit.....you can also put the stuff in water since she was doing some drinking....
Hoping she'll be alright Too...