So I think that's poop that's poorly digested. If her basking is around 80ish that's perfect for females. You'll want to generally avoid mealworms (They're not great for chams) and I suspect if she's eaten most of those, it's their less-digestible shell that you're seeing. I'd stick with crickets and look into dubia roaches, black soldier fly larvae (BSFL), silkworms, and the occasional hornworm.
Chameleons need that basking heat in order for them to properly digest their food. Because of this, I recommend feeding her in the morning - that way after eating she has plenty of time to bask and get warm enough to properly digest before she starts settling down for bed. My Little Guy gets fed in the mornings about an hour after his lights come on. It's part of my morning routine and usually happens between giving my dogs their medicine and me getting dressed for work. That helps my cham keep his consistent schedule.
My guy has had a poop or two that wasn't totally digested and I suspect it was usually due to him eating later in the day or too many BSFL - they're harder to digest, I think. Which is why I think you're seeing mealworms there.
My suggestion is to watch for the next couple of poops and see if you have the same issue.
I also suggest posting pictures of your enclosure and chameleon as well as fill out the husbandry form so we can take a look at her and her environment to rule out any other potential causes