Lilly's chocolate bars. You can find them at King Soopers. They're expensive, but my diabetic hubby can eat them (in moderation) because they are sweetened with Stevia.

All other diabetic friendly sugar-free snacks come with a horrible, horrible price tag.

You could also give her nut mixes, but the problem with those is that it's hard to stop eating nuts if they have salt on them. Honestly, I'd get her a couple of those chocolate bars. They have a few flavors. The coconut sucks, but the others are good.