Wax worms should definitely be a snack. They are really fatty, and don't have a ton of nutritional value. While you should be supplementing with powders, they aren't enough without a varied diet, or at least a gut loaded cricket diet. First make sure your temps and husbandry are correct. If you haven't tried phoenix worms, I would try those. They are soft like wax worms, but they are nutritious and are naturally full of calcium. How old is she? If she's not growing, but munching on a lot of wax worms she might have internal parasites. The first thing I would try would be skipping a couple of days feeding, then offering a few crickets and phoenix worms. If she doesn't eat then, you might want to get a fecal done to check for parasites. Stop feeding waxies and wait a couple of days, then try a couple of various bugs. If your husbandry is correct and that doesn't get her eating right again, see if she has parasites.