Thanks for the seasoned advice as always, dakski.
Her temps and humidity seem stable, though I am a bit worried whether the cool side of her cage/tank is cool enough. The digital thermometer I have on that side has been reading around 77-79 degrees, but I have reason to believe it's a bit off. When my heating system was coming out of the night drop this morning, the thermometer was reading 77 degrees on the cool side, while the Herpstat probe on her basking spot (which I trust a great deal more) was reading 75 degrees (I've read a night drop to 75 is good/fine for boas; correct me if I'm wrong). I'm not sure if this is a function of differences between the probes (the digital thermometer's is covered in black plastic, the Herpstat's is not) or if there's something wiggy going on. I may try a new digital thermometer or keep an old-school mercury thermometer on the outside of her tank to monitor ambient temps in the room. In the interim, a new infrared thermometer is due to arrive soon, so maybe some surface temps will be enlightening.
The plan is to keep handling to a minimum for the first two weeks or so (outside of the necessary feeding and water changes) and to start tap training right away. The hissy fit was a function of me looking in on her through the glass of her tank - I'd be pretty startled too if I woke up to a kaiju-size face staring at me. I'm blocking three sides of her tank tomorrow with some re-purposed paper bags to help her feel more secure. If she still seems tense I'll make a blind for the front as well.