From what I hear meal worms aren't very good for chameleons, they have a hard exoskeleton (skin), and not a lot of "meat". You could try small or medium sized super worms, they sorta look like meal worms but they have more "meat" and you can (and should) gut load them the same as crickets.
If you do feed her meal worms don't feed to manny. for the reasons above, and I've heard they could cause impaction (which is like constipation for a lizard but can be deadly)
Other worms you could try are, phoenix worms (also called repti worms), silk worms, butter worms and horn worms.
If you can find some place that you KNOW doesn't use pesticides you could catch wild grass hoppers, katydids etc. you might want to put them in a container and feed them a few days just to make sure they haven't eaten anything poisonous to your chameleon.