Update #2: we now have definitive answers: University of Florida confirmed my vet's IBD diagnosis via PCR, and that Satin is positive for the arenavirus. This will not change our treatment plan since we were already treating her as confirmed. It does raise many questions on how she got it or when she was exposed, as for the last almost decade I am the only person I've known that's had a snake. I'm not sure we will ever know the answer, but I hope somehow Satin's saga helps someone as it's possible she could have been asymptomatic for YEARS before this manifested.
Her bloodwork is normal except for her WBC count (the ones that handle inflammation specifically) is still somewhat elevated - since she had a major infection we are not sure if they are elevated due to the bone growth in her spine, or if the infection is still lingering. We'll be rechecking a CBC in 4-6 weeks to see if we can find a pattern.