I agree with the solutions that have been presented here thus far: get her on probiotics ASAP, switch feeder suppliers (I like Cold Blooded Cafe), if you want to investigate further start with an x-ray as that is not invasive, does not require sedation, and you may be able to see an abnormality this way. Would not jump to a CT scan without an x-ray first.
Also want to mention that I would not necessarily feed larger prey items or feed more frequently if she is having digestive trouble. That may add undue stress to her system. I would stick with normal size and normal spacing between feedings for now. Get her established on the probiotics and see if things improve. Once she can digest properly and is getting the normal amount of nutrition from her food again her weight and body tone may improve on its own. A stressed GI tract does not do better with added stress. Just something to keep in mind.