A vet visit is in order. He can palpate her, and do radiographs if needed to determine gravidity. He will also have physical eyes on her tail rather than pictures. Although I respect everyone’s input here, I don’t sweat feeding supers every so often. In fact, I think as <15% of total diet, they’re not a bad feeder. Try feeding her a few less dubias, wait until she’s eaten them, then give her a super or two. Honesty though, you should probably see a vet before making any changes...just to be safe. Her tail does look thin, but forum pics are not the best diagnostic tool. My girls’ tails look like that when they flare up and give me that sweet veiled gular action. A vet seeing her in person over several minutes will be able to better judge.
Ps: If it turns out you do need to fatten her up, there are other alternatives to supers: waxies and butters are also fatty with less chitin. I know, I know: butters are irradiated so that’s scary and all, and waxies can have high saccharides, so that’s bad too. Sigh! No food is perfect. Anyways, vet first, then make deliberate conservative choices.