I agree with the above. You don't want to wait on this one. Take her to the vet immediately. In addition to the soft jaw causing a loss of appetite, she probably won't be seen outside her hide very often.
They can eventually get their calcium back once lost but her legs will likely remain deformed.
I've used a product provided by my vet called calcionate to boost my gecko's calcium intake during a recent hunger strike. The strike was still on after 4 weeks and early MBD was a concern. 4-6 weeks without sufficient calcium is about the amount of time a typical gecko will last before MBD sets in.
If prescribed by your vet, they may have you administer it via eyedropper or in a more controlled fashion via syringe. Usually you'll put a drop of the liquid on her nose and with some patience on your behalf she'll start licking it off. Once they start licking it's usually pretty easy to feed the drops directly on their tongue until the proper amount is administered. The vet will explain all this to you if this route is exercised.
Calcionate might be the generic name for Neocal but I'm not sure.
As mentioned, there's also a calcium shot the vet can administer to boost calcium blood levels quickly but it is not without risks. According to my vet the sudden change can cause seisures. The calcionate is a more gradual approach.
Good luck with her and please do get her in to a vet right away!
N.F.