As you can probably tell, I've known my share of challenging snakes that didn't want to eat.(Most of them were BPs...but not all.)
You're feeding your snake too frequently for an adult snake. "Weekly" is for neonates & hatchlings, not adults. That's probably part of your trouble in getting her to take dead (f/t or p/k) prey...she's just not that hungry. I do understand how unnerving it can be though, for a snake to fast, since we can't help comparing them to how we'd feel, or how poorly our other pets would fare, but truly snakes have evolved to fast during cold seasons. I can also understand how you might be nervous about "rocking the boat" with any changes.
As far as treatments for parasites or pathogens, it's essential to find out WHAT needs treating, & not just guessing what will work. That's where a stool sample & a vet visit comes in.
Usually it's a matter of administering an oral medication, or an injection. It really depends on what the cause is though...there's many possibilities & the wrong medication won't help, & could hurt.
As long as your vet has experience with snakes, that's the main thing, as they're quite different from the typical warm-blooded pets, & different drugs are either safe or unsafe for them. It sure would be interesting to take some fresh stool from one of the live rats too. Not everything that affects warm blooded animals can affect our cold-blooded buddies: while I think what's ailing your snake is LIKELY from the sick rats (because it's a pretty big "coincidence" otherwise), it might not be, you never know.







(Most of them were BPs...but not all.)
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