Sick Carpet Python

[SteamBug]

Help!
I am pretty sure my snake has Blister Disease (she is a jungle carpet python and 4' long). I removed some of the blisters a month ago and put hydrogen peroxide on where the blisters were and she seemed fine for a while. Yesterday I noticed some of them had come back, and upon further inspection realized her skin looks in bad shape, like it has spread everywhere. I wanted to bring her to a vet, but every vet I call wants a $90-$180 fee just for seeing her (before any treatment) and no-one will talk to me about what treatment would cost or if there is anything I can do for her on my own.
I really love this snake and I want her to be okay. Is there anything I can do to help her? From what I have researched I plan to remove and clean dead skin, make sure her heat source is from above and keep her in an immaculately clean cage. Maybe soak her in betadine. I was also hoping to be able to give her an anti-biotic (like Baytril), but none of the ones recommended for snakes are available over the counter (that I can find). What can I do to help her?