Abnormal Ball Python behavior.

[Venoshock]

When my vet thought that my Bp was developing an RI, she told me to switch substrate to paper towel (I was using aspen bedding) and to give him a "bath" twice a week. I just have him soak in a tub of warm water, keep it covered for humidity.
The sneezing and whatnot is definitely a sign of a respiratory infection though. Is she star gazing too? They're known to stare up to let the fluids in their throat drain during an RI.

She only sneezed the first day I got her home, so it was probably just a change in environment. I don't believe she has an RI because she doesn't have any of the indicator symptoms like open mouthed/labored breathing and nasal discharge, though I won't discount the possibility. She does sometimes point her head up but I think its mostly her wobble.

Right now I have her humidity up around 70% but the only reason is because she's in shed. When she's done its going right back to the 60% range.

Like the others said, high humidity is bad when you have a sick snake. I don't know what your vet might have been thinking in giving you that treatment. They should have cultured and prescribed antibiotics if it was an RI.