That's very odd. Are you certain that she hasn't done this before? An injury that would cause such a sound I would thing to be quite bad and possibly easily infected. Serious tissue damage inside the mouth or throat. They usually still breath through the nose while eating since inhaling would result pretty much how it does for us when we have a mouth full. They breath by using the muscles in the roof of their mouth. contracting and relaxing these muscles drawls air into the nostrils and back out. Like having a diaphragm in their mouth.
Without actually witnessing this sound as she eats or hearing it, it is difficult to say what this sound true is. Maybe try and capture a video with the sound and post it here.





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