Let's review: you aren't seeing bubbles or mucus? You aren't hearing clicking, whistling or squeaking sounds? Just abnormal yawning?
I would suggest NOT panicking...snakes do yawn, often it's an effort to re-set their jaws after eating. Have you looked closely at her mouth? Some snakes bump their
faces & get part of their mouth caught on their teeth, or this happens when they eat...yawning is an effort to straighten them out (un-hook the offending teeth). It's also
possible that some old shed remained on her face/chin after the last shed, and she's trying to loosen it? Raising humidity might be helpful, yours is or was too low anyway.
Either that, or you're really boring to your snake?(joking)
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