So it's been another week and she isn't getting worse, but is also not getting any better, so I'm going to go with some more antibiotics.
So after doing my research and talking to my vet, the recommended antibiotic is TMS, which they only have in an oral solution. He says it's very difficult to give for ball pythons and injectables are much easier. Has anyone given oral meds before? I think I can do it as I've been getting more accustomed to holding Wintre's head and getting her mouth open in assessing her illness. They said they can order TMS in an injectible solution, but they don't know how long it will take to get.
The alternative is Zosyn, which he says may or may not work on the S. Maltophilia.
I think the oral is my only real option at this point. Time to watch some more youtube videos on it...