Get her a cooling vest. I wear one when I'm on my motorcycle and it's hot as fuck. Basically you soak it in ice water, then wring it out and put it on under any other shirts. Stays cold for quite a while. It's actually shockingly cold at first.
Only downside is it would probably make her look like she's sweating so bad she must be having a heart attack.
Also, back in the day my mom used to make these these maybe 1.5-2" diameter tubes of fabric, maybe a foot and a half or so, that were stuffed with this cooling gel (in self-contained things not just splurted into the fabric). You either dunk them in water, or freeze them, or whatever you can and then wear them around the back of your neck. She would send them to the troops.