Personally I'd minimize the air-flow (with a small vent area on either side of the top- the one over the warm side will draw air up & out, while the one over the cool side will bring fresh air in).
Continue using substrate that holds humidity. AND, if her humidity is still too low, install a "humid hide" so she can get more humidity whenever she needs it. (You'll probably need to mist inside it at least weekly, but that's better, IMO, than making the whole enclosure wet, becausewith BPs, all that warmth + moisture can promote scale problems- fungal & bacterial infections etc.)
I wouldn't humidify the whole room unless YOU want it (-do you live in the desert?), since sometimes excess humidity causes problems (mold, fungus, mildew), especially in a closed-off room. Whole room = overkill, IMO.
Feels good to have a little success finally, eh? I hope it gets easier for you now...we ALL made mistakes at the beginning...which is why we share our knowledge here, so others don't have to repeat our mistakes, & so their snakes will thrive.![]()