Thanks for the clarification & update. I would NOT have accepted her at that price in this condition either, if that will make you feel any better. For any seller not to disclose such issues is a deal-breaker- especially at full-price. It's bad enough putting a healthy snake thru shipping, but sending one back & forth, & one that needs care? Anyway it's "on" the seller, & financially-speaking, & you're probably better off with the decision you've made to return her, since you never know how expensive OR how successful treatment will be. Sorry this didn't work out better, but don't beat yourself up- it's not your fault. When a seller fails to disclose issues or pretends they didn't see them, it would make my suspicious mind wonder if they tried to treat & failed- & already knew that it's either going to require expensive care or is resistant to treatment.