I have no clue. But I think the mouth thing was probably because she was very near the end.
Though I would have loved to know what happened, my son decided to bury her. A few days after, once he was over the worst of it, he regretted that he didn't let me chill her so we could send her to Guelph Vet University.
Martha's breeder has another young snake identical to Martha, I am tempted to get it but my son wants to wait.