It looks similar to what happened to my boa when she was a baby. In her case it was simply that her teeth had gotten caught on her bottom jaw. It's happened with her a few times, though not usually to the degree of the picture I posted. Normally I leave her alone to see if she can figure it out herself. The one time she didn't seem to be getting it on her own (as pictured), I gently pried her mouth open to avoid hurting her, and got it unstuck from the tooth. She then realigned her jaw and was fine. I can't say that that's exactly what is happening with yours, but this was my experience.
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