A. This sounds like a serious condition, possibly botulism tetany (locked jaw) or even hypocalcemia (low calcium) causing tetany (muscle spasm or cramp).
This is something you want to get seen right away for. I would highly recommend taking her into the vet, especially if there is no rhyme or reason for this to be happening to your pet. Typically this is not a transient thing that will just go away on its own and needs to be tested and treated properly.
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