I feel like you might be hitting the nail on the head with the comment about prey size. She was eating close to this same size rat last fall and has gained probably 8-10lbs since then. She might just be hungry?
At least you have options within the same state and within an hour drive for vets. The only registered reptile vet near me is in Alabama somewhere around 2 hours away if I remember correctly. Teaching 4 college classes a semester leaves very little time to make 4hr round trips to vets that possibly could cancel your appointment 15 minutes before you’re supposed to show up because the doctor is apparently scared of the size of your snake. Which I know isn’t an excuse for not visiting a vet, hence the off hand comment a while back about almost thinking to rehome her
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