So sorry to hear this, Dave. Maybe she has an issue with her thyroid, like hyperthyroidism? Quick searching out of curiosity- this was about goiter & thyroid disease>
https://jherpmedsurg.com/doi/pdf/10....9651.18.3-4.75
Excerpt & food for thought: "...nutritionally deficiencies, exposure to goitrogenic substances, exposure to and bioaccumulation of endocrine-disrupting contaminants from the environment, genetic predisposition, or a combination. Supplementation with iodine was attempted in some snakes in various ways but was generally unsuccessful..."
There's a few articles around, but this is a pretty obscure topic in snakes...https://www.researchgate.net/publica...thyroid_Glands
Anyway, in the excerpt above, what jumped out to me was "bioaccumulation of endocrine-disrupting contaminants" & while it might have nothing to do with Behira's issue, that is one reason that I avoid plastics for snakes. (who knows what might affect our diminutive scaly friends?) I would think if this was a genetic quirk, you would have seen this from the start? Pardon my brainstorming...I hope your vet has some ideas...(& I hope they're easier to spell, lol).
Briefly from Wikipedia:
What are the four types of endocrine disruptors?
These include polychlorinated biphenyls (PCBs), polybrominated biphenyls (PBBs), and dixons. Other examples of endocrine disruptors include bisphenol A (BPA) from plastics, dichlorodiphenyltrichloroethane (DDT) from pesticides, vinclozolin from fungizides, and diethylstilbestrol (DES) from pharmaceutical agents.
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