I am not familiar with the "sneezing" of your ball python but an RI is a concern. As far as your humidity goes I am assuming she is kept in a glass enclosure? If so I would go to Home Depot or Lowe's and purchase a plexiglass and have them cut it to fit the top two thirds of the enclosure. Place it above the water bowl and your humidity will be much better with little effort on your part.

Good Luck!