Maybe. For one thing, you're adding to her stress. A superficial issue on your snake's tail does not require a "bath"...you can treat it with less stress to your snake by
dabbing the Betadine on using a cotton ball or piece of gauze or cloth. A picture here may or may not help us help you, but without seeing it, we are guessing totally
in the dark. (you wouldn't be the first person to call something "scale rot" that is something else entirely)
I could understand you taking her to the vet for the "scale rot" & to double-check for an RI, but giving injections that aren't warranted* can do more harm than good.
Antibiotics are normally given for a full-course, are NOT without potential negative effects, & are ONLY helpful IF it's the correct one for the specific infection, so if your
vet didn't do any lab work to find the correct antibiotic, that added to her stress & may do more harm than good. (antibiotics not given for a full course end up creating
"resistant" pathogens, & I'm assuming that's what the injection was...but again, you're making us guess.)
Lastly, we have no information about how you're keeping this snake...many things can cause a BP to keep refusing food. So please provide more info, see this thread &
fill in the many information gaps:
https://ball-pythons.net/forums/show...t-Questionaire