How old is your daughter?

Any injury/swelling, bruises, fall off the bed, sleep walking??
could she be hyper mobile - lax joints?
Could be just an odd pinched nerve causing the jaw to go out.

Possibly an expert chiropractor could help figure it out- or at least give an evaluation and thoughts on what might be the trouble. They study on the bones/joints and related body systems more hours than MDs.

Chiropractors are able to adjust much more than only the spine, mine has adjusted my elbows, ribs, wrist, shoulder... I have hyper mobile joints so things go out quite easily sometimes.