I haven't seen this before, but if she's dehydrated, try giving her a "sauna" every night or every couple nights until she bounces back from the dehydration.  That should also help with her stuck shed. At this point, all you can really do (that I know of) is to keep feeding them their CGD; she'll get better, but never perfect.  If her previous ownders were only feeding them CGD dusted with calcium with D3, then yeah, D3 could be her problem.  Since she has good sacs right now, I wouldn't bother with giving her any other calcium supplements, especially since they're both pooping (calcium deficiency and dehydration can halt digestive tracks).

TL;DR: just keep feeding them CGD and maybe give them a few saunas; they'll get better, but it doesn't sound like the girl will ever be "perfect"

Note: I am not an expert, so definitely get other people's opinions, not just mine

(by CGD I meant crickets; I am a dodohead)

(Argh! Again I am a dodohead! I only meant CGD to be crickets in this sentence: "If her previous owners were only feeding them CGD dusted with calcium with D3, then yeah, D3 could be her problem.")

I second the keep on with the GCD only.  I also agree with the "sauna" idea, but I would take it a step farther and mix a bit of unflavored pedialyte in with the sauna water and her drinking water.  Make sure, however, that you are changing her water daily, as I've found pedialyte goes slimy after sitting for a while.

I took one in (Butter on my deceased list) who had some serious issues with her calcium. She was being fed bugs and baby food from her previous owner. We ceased bugs for a long time and added additional calcium supplements (without d3) to her CGD and hand fed her for a long time.... a few months AT LEAST. Eventually her FTS got so bad that her spine began to curve, so I assisted with a tail drop. Her tail was all rigid and kinked, and just looked painful. Her front feet were curved inward and she had a hard time gripping. After dropping her tail and continuing her on her diet, she eventually became more lively and in good spirits. She put on weight and appeared to be comfortable with her condition. She lived quite a while that way, until she took a hard fall from the top of the enclosure all the way to the bottom. In the end, it wasn't entirely the MBD that killed her, it was what the MBD had done to her front feet, disabling her to catch herself when she lost grip. 

All I can recommend is diet, and monitor. 

I would try 15-20 minutes of natural sunshine daily so her body is able to utilize the calcium she has. A lot of vets recommend natural sunshine for the beneficial UV to reptiles with mending bones from breaks, MBD, etc. I'd also consider getting Rescue-Cal, it's a Repashy made product that can help get her on the right track even if she has calcium sacs(a drop or two a week for a month is probably all she needs).