Helix has been doing the same exact thing for about 3 months now, only she won't even take baby food. She half heartedly goes after a cricket when one is near her, but that is about all. I took her to one vet, he said she is perfectly fine and she is probably burmating. I wasn't quite satisfied, so I took her for a second opinion. This vet ran a bunch of tests and again came back with the same conclusion -- burnation. Unfortunately I am now broke from vet visits, so I can't afford a third opinion.
They said just continue to to dust her crickets with calcium and repto-min with beta carotine, and to let her soak like I usually do (every other day for 20 mins). That's all the advice I received from two highly recommended herp vets in my area. For some reason, it still does not sit well with me, but I don't quite know what to do at this point either, except to continue trying to encourage her to eat until she snaps out of it.
If it would make you feel better, I highly suggest take your beardie to the vet, just be prepared to shell out a few bucks. My visit to the first vet ended up costing me about $175 for just an "exam" and the second vet cost almost $650 with all the tests he did.
PS... they didn't seem all that concerned that she only had one poo in these past 3 months, and this is something that I stressed to both vets.
Good luck and let me know how eveything turns out!