Could be a deformity then maybe, I'm just spitballing here.. or some type of defect especially if she just hatched out. She's probably in pain honestly. You could call your vet to get some better advice (I do it all the time) but if that were me, with this new info. considered, I would put her down humanely. See what your vet says though; they will definately know more & may have options for you.