Thank you, for the sake of my other snakes I'm hoping it was congenital but of course I wouldn't wish anything ill of any of my snakes or others'. It's just sad thing that happened.
The fatty tissue and he explained that when he checked her exterior instead of having the healthy body shape of a slight triangle or circular she was actually shaped like what I would call an apple (ie fat actually bulging out from her spine, if that makes sense)? I feel bad that I've never noticed her shaped like this before (she always looked and felt circular to me) and tomorrow I'll be looking everyone over to see if they're showing this body shape. If any are (I'll be looking especially close at my adult King who's been on the same feeding schedule as Vera) I'll take some pics and they'll be going on a diet.