I'm one of those women with an impressive sense of smell - if a snake in a rack made a mess, I will know it just by walking by. I can't smell it across the house though.

First, you need to figure out what she's smelling as it may not be the reptiles or even their feces. It could be damp substrate - both wet cypress and spaghnum moss smell very "earthy" to me, though it's not a bad smell it is distinct. Even newspaper in a humid environment picks up an odor after a few days.

Second, it could be a smell that you've become used to over time. A while back I purchased a used hatchling rack and the tubs had a very distinct odor to them. I don't know what it was, but I do know that cleaning with dish soap and even wiping with Clorox wipes didn't remove it - but soaking in OxyClean did. The odor didn't register with the seller.

Third, is it possible to adjust the airflow in the house or isolate your room so any odors get vented outside instead of through the HVAC system?