Some individuals will result to ventricular phonation if the true vocal folds do not meet well. It has a rather peculiar sound to it which is hard to describe if you have not heard, but it is usually rather low, raspy, and lots of breath wastage.
I'm not sure she is resorting to this from what you describe. Frankly, it sounds more like polypoid degeneration of the true vocal folds due to smoking and excessive voice use. We've all heard this before, the female smoker with the strange low, masculine, coarse voice.
Randy Buescher
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